Find all School-related info fast with the new School-Specific MBA Forum

It is currently 28 Sep 2016, 00:26
GMAT Club Tests

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

A list contains twenty integers, not necessarily distinct.

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

6 KUDOS received
Director
Director
User avatar
Status: Verbal Forum Moderator
Joined: 17 Apr 2013
Posts: 635
Location: India
GMAT 1: 710 Q50 V36
GMAT 2: 750 Q51 V41
GMAT 3: 790 Q51 V49
GPA: 3.3
Followers: 56

Kudos [?]: 353 [6] , given: 297

A list contains twenty integers, not necessarily distinct. [#permalink]

Show Tags

New post 17 Jun 2014, 10:42
6
This post received
KUDOS
17
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  95% (hard)

Question Stats:

33% (01:58) correct 67% (00:57) wrong based on 251 sessions

HideShow timer Statistics

A list contains twenty integers, not necessarily distinct. Does the list contain at least two consecutive integers?

(1) If any single value in the list is increased by 1, the number of different values in the list does not change.

(2) At least one value occurs more than once in the list.
[Reveal] Spoiler: OA

_________________

Like my post Send me a Kudos :) It is a Good manner.
My Debrief: http://gmatclub.com/forum/how-to-score-750-and-750-i-moved-from-710-to-189016.html


Last edited by honchos on 24 Jun 2014, 09:17, edited 1 time in total.
4 KUDOS received
Manager
Manager
avatar
Joined: 23 May 2014
Posts: 106
Followers: 0

Kudos [?]: 27 [4] , given: 6

Re: A list contains twenty integers, not necessarily distinct. [#permalink]

Show Tags

New post 17 Jun 2014, 11:20
4
This post received
KUDOS
ill reduce the numbers to 5

(1) If any single value in the list is increased by 1, the number of different values in the list does not change.
suppose the numbers are 1, 3, 5, 7, 9
a) If we increase any of the above numbers by 1 then the number of distinct value does not change.
The values are not consecutive.

b) suppose the numbers are 2, 2, 3, 6, 9
If we increase the value of 2 by 1 then the list will become 2, 3, 3, 6, 9
The number of distinct values still remains same. But the numbers are consecutive.
For this to happen two numbers need to be consecutive.

Two different answers, therefore 1 is not sufficient.


(2) At least one value occurs more than once in the list.
Clearly insufficient.

Both together will give us condition b discussed above.
Hence both are sufficient together.

Ans: C

Last edited by shank001 on 18 Jun 2014, 11:59, edited 1 time in total.
Expert Post
4 KUDOS received
Veritas Prep GMAT Instructor
User avatar
Joined: 16 Oct 2010
Posts: 6916
Location: Pune, India
Followers: 1993

Kudos [?]: 12386 [4] , given: 221

Re: A list contains twenty integers, not necessarily distinct. [#permalink]

Show Tags

New post 18 Jun 2014, 03:24
4
This post received
KUDOS
Expert's post
1
This post was
BOOKMARKED
honchos wrote:
A list contains twenty integers, not necessarily distinct. Does the list contain at least two consecutive integers?

(1) If any single value in the list is increased by 1, the number of different values in the list does not change.

(2) At least one value occurs more than once in the list.


Even though shank001 has provided a great solution above, I would like to give my thoughts on this question.

Here, it is easy to fall for statement 1. At first, it seems as if statement 1 is sufficient. Say, if any single value is increased by 1, it doesn't match any other value already there in the list, it means that there are no consecutive integers. What you might forget that when you increase a number by 1 is that one distinct integer is getting wiped out and another is taking its place!

But your statement 2 should give you a hint. Since statement 1 doesn't tell you that all values are distinct, statement 2 should make you think that you need to consider the case where one value occurs more than once in the list. In that case, is it possible that number of different values in the list does not change even though there is a pair of consecutive integers?

Say 5, 5, 6, 9, 20, 50, 57, 87 ... etc
Now if you increase 5 by 1, you get 6 and number of distinct integers stays the same! In this case, if there are no consecutive integers, the number of distinct integers will increase. Hence if the numbers are not all distinct and the number of distinct numbers needs to stay same, there must be a pair of consecutive integers.

This tells you that statement 1 is not sufficient alone and you need both statements to answer the question.

Takeaway - Just as when you get an easy (C), you must check whether the answer could be (A) or (B), when you feel that the answer is (A) or (B), you might want to check whether the other statement is necessary to establish any one statement alone.
_________________

Karishma
Veritas Prep | GMAT Instructor
My Blog

Get started with Veritas Prep GMAT On Demand for $199

Veritas Prep Reviews

Director
Director
User avatar
Status: Verbal Forum Moderator
Joined: 17 Apr 2013
Posts: 635
Location: India
GMAT 1: 710 Q50 V36
GMAT 2: 750 Q51 V41
GMAT 3: 790 Q51 V49
GPA: 3.3
Followers: 56

Kudos [?]: 353 [0], given: 297

Re: A list contains twenty integers, not necessarily distinct. [#permalink]

Show Tags

New post 18 Jun 2014, 12:02
VeritasPrepKarishma wrote:
honchos wrote:
A list contains twenty integers, not necessarily distinct. Does the list contain at least two consecutive integers?

(1) If any single value in the list is increased by 1, the number of different values in the list does not change.

(2) At least one value occurs more than once in the list.


Even though shank001 has provided a great solution above, I would like to give my thoughts on this question.

Here, it is easy to fall for statement 1. At first, it seems as if statement 1 is sufficient. Say, if any single value is increased by 1, it doesn't match any other value already there in the list, it means that there are no consecutive integers. What you might forget that when you increase a number by 1 is that one distinct integer is getting wiped out and another is taking its place!

But your statement 2 should give you a hint. Since statement 1 doesn't tell you that all values are distinct, statement 2 should make you think that you need to consider the case where one value occurs more than once in the list. In that case, is it possible that number of different values in the list does not change even though there is a pair of consecutive integers?

Say 5, 5, 6, 9, 20, 50, 57, 87 ... etc
Now if you increase 5 by 1, you get 6 and number of distinct integers stays the same! In this case, if there are no consecutive integers, the number of distinct integers will increase. Hence if the numbers are not all distinct and the number of distinct numbers needs to stay same, there must be a pair of consecutive integers.

This tells you that statement 1 is not sufficient alone and you need both statements to answer the question.

Takeaway - Just as when you get an easy (C), you must check whether the answer could be (A) or (B), when you feel that the answer is (A) or (B), you might want to check whether the other statement is necessary to establish any one statement alone.


Karishma (1) gives YES and NO so Insufficient
(2) Insufficient

Even (1) and (2) together Gives yes and NO situation So answer should be E.

Suppose 1,3,3, 5, 7, 9,11, 13,15,17,19,21,23,25,27,29,31,33,35,37.

from (1) and (2) IF WE INCREASE 3 then we may get consecutive Number, but it is not essential. The condition is of May so (1) and (2) also Gives Yes and No situation hence the answer is E.
_________________

Like my post Send me a Kudos :) It is a Good manner.
My Debrief: http://gmatclub.com/forum/how-to-score-750-and-750-i-moved-from-710-to-189016.html

Manager
Manager
avatar
Joined: 23 May 2014
Posts: 106
Followers: 0

Kudos [?]: 27 [0], given: 6

Re: A list contains twenty integers, not necessarily distinct. [#permalink]

Show Tags

New post 18 Jun 2014, 12:16
If we increase 3 to 4, then the first statement is violated - the number of distinct values should remain same after increasing value by 1.
To satisfy both stmt one and stmt two, we need to make sure that increase by 1 does not create a new number in the list.
this can be achieved only when there are two consecutive numbers on the list.


hope this helps.


honchos wrote:
VeritasPrepKarishma wrote:
honchos wrote:
A list contains twenty integers, not necessarily distinct. Does the list contain at least two consecutive integers?

(1) If any single value in the list is increased by 1, the number of different values in the list does not change.

(2) At least one value occurs more than once in the list.


Even though shank001 has provided a great solution above, I would like to give my thoughts on this question.

Here, it is easy to fall for statement 1. At first, it seems as if statement 1 is sufficient. Say, if any single value is increased by 1, it doesn't match any other value already there in the list, it means that there are no consecutive integers. What you might forget that when you increase a number by 1 is that one distinct integer is getting wiped out and another is taking its place!

But your statement 2 should give you a hint. Since statement 1 doesn't tell you that all values are distinct, statement 2 should make you think that you need to consider the case where one value occurs more than once in the list. In that case, is it possible that number of different values in the list does not change even though there is a pair of consecutive integers?

Say 5, 5, 6, 9, 20, 50, 57, 87 ... etc
Now if you increase 5 by 1, you get 6 and number of distinct integers stays the same! In this case, if there are no consecutive integers, the number of distinct integers will increase. Hence if the numbers are not all distinct and the number of distinct numbers needs to stay same, there must be a pair of consecutive integers.

This tells you that statement 1 is not sufficient alone and you need both statements to answer the question.

Takeaway - Just as when you get an easy (C), you must check whether the answer could be (A) or (B), when you feel that the answer is (A) or (B), you might want to check whether the other statement is necessary to establish any one statement alone.


Karishma (1) gives YES and NO so Insufficient
(2) Insufficient

Even (1) and (2) together Gives yes and NO situation So answer should be E.

Suppose 1,3,3, 5, 7, 9,11, 13,15,17,19,21,23,25,27,29,31,33,35,37.

from (1) and (2) IF WE INCREASE 3 then we may get consecutive Number, but it is not essential. The condition is of May so (1) and (2) also Gives Yes and No situation hence the answer is E.
1 KUDOS received
Senior Manager
Senior Manager
User avatar
Joined: 13 Jun 2013
Posts: 279
Followers: 14

Kudos [?]: 309 [1] , given: 13

Premium Member
Re: A list contains twenty integers, not necessarily distinct. [#permalink]

Show Tags

New post 18 Jun 2014, 12:26
1
This post received
KUDOS
Quote:

(1) gives YES and NO so Insufficient
(2) Insufficient

Even (1) and (2) together Gives yes and NO situation So answer should be E.

Suppose 1,3,3, 5, 7, 9,11, 13,15,17,19,21,23,25,27,29,31,33,35,37.

from (1) and (2) IF WE INCREASE 3 then we may get consecutive Number, but it is not essential. The condition is of May so (1) and (2) also Gives Yes and No situation hence the answer is E.


hi lets shorten this set that you have considered. Suppose we have only first 6 elements in the set.
i.e . 1,3,3,5,7,9

now number of different elements in the set are 5 (1,3,5,7,9)

if i increase 3 with 1 then number of different element in the set becomes 6 (1,3,4,5,7,9) which violates the statement 1

but if we increase 1,5,7 or 9 with 1, number of different elements remains same. therefore we can safely conclude that we definitely have at least 2 consecutive integers in the set.
Expert Post
1 KUDOS received
Veritas Prep GMAT Instructor
User avatar
Joined: 16 Oct 2010
Posts: 6916
Location: Pune, India
Followers: 1993

Kudos [?]: 12386 [1] , given: 221

Re: A list contains twenty integers, not necessarily distinct. [#permalink]

Show Tags

New post 18 Jun 2014, 20:08
1
This post received
KUDOS
Expert's post
honchos wrote:
Karishma (1) gives YES and NO so Insufficient
(2) Insufficient

Even (1) and (2) together Gives yes and NO situation So answer should be E.

Suppose 1,3,3, 5, 7, 9,11, 13,15,17,19,21,23,25,27,29,31,33,35,37.

from (1) and (2) IF WE INCREASE 3 then we may get consecutive Number, but it is not essential. The condition is of May so (1) and (2) also Gives Yes and No situation hence the answer is E.


Actually the first statement says that if ANY number is increased by 1, the number of distinct values does not change. So the number of distinct values should stay the same for EACH value in the list. So when we increase the 3 by 1, the number of distinct values should not change. Hence the set given by you above is not possible.
It must be
1,3,3, 4, 7, 9,11, 13,15,17,19,21,23,25,27,29,31,33,35,37
_________________

Karishma
Veritas Prep | GMAT Instructor
My Blog

Get started with Veritas Prep GMAT On Demand for $199

Veritas Prep Reviews

Director
Director
User avatar
Status: Verbal Forum Moderator
Joined: 17 Apr 2013
Posts: 635
Location: India
GMAT 1: 710 Q50 V36
GMAT 2: 750 Q51 V41
GMAT 3: 790 Q51 V49
GPA: 3.3
Followers: 56

Kudos [?]: 353 [0], given: 297

Re: A list contains twenty integers, not necessarily distinct. [#permalink]

Show Tags

New post 22 Jun 2014, 22:15
VeritasPrepKarishma wrote:
honchos wrote:
Karishma (1) gives YES and NO so Insufficient
(2) Insufficient

Even (1) and (2) together Gives yes and NO situation So answer should be E.

Suppose 1,3,3, 5, 7, 9,11, 13,15,17,19,21,23,25,27,29,31,33,35,37.

from (1) and (2) IF WE INCREASE 3 then we may get consecutive Number, but it is not essential. The condition is of May so (1) and (2) also Gives Yes and No situation hence the answer is E.


Actually the first statement says that if ANY number is increased by 1, the number of distinct values does not change. So the number of distinct values should stay the same for EACH value in the list. So when we increase the 3 by 1, the number of distinct values should not change. Hence the set given by you above is not possible.
It must be
1,3,3, 4, 7, 9,11, 13,15,17,19,21,23,25,27,29,31,33,35,37


Right Karishma,

But If I would have seen this question directly on Gmat. I would have opted E.

Karishma any advice, last time when I gave my examination on December 10 2013 I scored Q50 V36, 710.

Any advice How to take somewhere between 750-770
_________________

Like my post Send me a Kudos :) It is a Good manner.
My Debrief: http://gmatclub.com/forum/how-to-score-750-and-750-i-moved-from-710-to-189016.html

Expert Post
1 KUDOS received
Veritas Prep GMAT Instructor
User avatar
Joined: 16 Oct 2010
Posts: 6916
Location: Pune, India
Followers: 1993

Kudos [?]: 12386 [1] , given: 221

Re: A list contains twenty integers, not necessarily distinct. [#permalink]

Show Tags

New post 23 Jun 2014, 01:20
1
This post received
KUDOS
Expert's post
1
This post was
BOOKMARKED
honchos wrote:
Karishma any advice, last time when I gave my examination on December 10 2013 I scored Q50 V36, 710.

Any advice How to take somewhere between 750-770


With a Q50, most of your effort should be directed toward Verbal. Just continue practicing some Quant questions regularly so that your skills don't rust.
As far as Verbal is concerned, I assume you are average to above average in 2 question types and quite good in the third one. To hit V42, you need to be quite good in 2 of the three and average to above average in the third. Pick up one of CR, SC and RC and work extra hard in that to ensure that you are very good in at least two of the three question types.
_________________

Karishma
Veritas Prep | GMAT Instructor
My Blog

Get started with Veritas Prep GMAT On Demand for $199

Veritas Prep Reviews

Manager
Manager
User avatar
Joined: 21 Aug 2014
Posts: 138
GMAT 1: 610 Q49 V25
GMAT 2: 730 Q50 V40
Followers: 6

Kudos [?]: 130 [0], given: 49

Re: A list contains twenty integers, not necessarily distinct. [#permalink]

Show Tags

New post 19 Jul 2015, 12:18
Hi VeritasPrepKarishma,

I used the following approach and marked E as the answer:

Statement 1) If any single value in the list is increased by 1, the number of different values in the list does not change.

Here, I used 2 sample Sets:
A = {10,2,3};# of different values = 3
B = {10,2,2};# of different values = 2

Option 1: A(+1) = {11,2,3}; # of different values = 3
Option 2: A(+1) = {10,3,3}; # of different values = 2 Discarded because does not satisfy the condition of different values
Option 2: A(+1) = {10,2,4};# of different values = 3
Are the numbers consecutive? YES.

But before I say, 1) is sufficient, I went to Set B.

Option 1: B(+1) = {11,2,2}; # of different values = 2
Option 2: B(+1) = {10,2,3}; # of different values = 3; Discarded because does not satisfy the condition of different values
Are the numbers consecutive? NO.

Therefore, Insufficient.

Statement 2: At least one value occurs more than once in the list.
Set B = {10,2,2} satisfies the condition here, so I took that. But it does not have 2 consecutive integers. So, the answer to the question is NO.
and also, C = {10, 2,2,3,3}. It has 2 consecutive integers. So, YES.
Insufficient

Statement 1) and 2) together:
B = {10,2,2}; # of different values = 2
And, B(+1) = {11,2,2}; # of different values = 2
Are the numbers consecutive? NO.

C = {10, 2,2,3,3}; # of different values = 3
C (+1) = {11,2,2,3,3}; # of different values = 3
Are the numbers consecutive? YES.

Still insufficient.

Please explain where did I go wrong? Thanks.
_________________

Please consider giving Kudos if you like my explanation :)

Expert Post
1 KUDOS received
Veritas Prep GMAT Instructor
User avatar
Joined: 16 Oct 2010
Posts: 6916
Location: Pune, India
Followers: 1993

Kudos [?]: 12386 [1] , given: 221

Re: A list contains twenty integers, not necessarily distinct. [#permalink]

Show Tags

New post 20 Jul 2015, 23:09
1
This post received
KUDOS
Expert's post
Patronus wrote:
Hi VeritasPrepKarishma,

I used the following approach and marked E as the answer:

Statement 1) If any single value in the list is increased by 1, the number of different values in the list does not change.

Here, I used 2 sample Sets:
A = {10,2,3};# of different values = 3
B = {10,2,2};# of different values = 2

Option 1: A(+1) = {11,2,3}; # of different values = 3
Option 2: A(+1) = {10,3,3}; # of different values = 2 Discarded because does not satisfy the condition of different values
Option 2: A(+1) = {10,2,4};# of different values = 3
Are the numbers consecutive? YES.

But before I say, 1) is sufficient, I went to Set B.

Option 1: B(+1) = {11,2,2}; # of different values = 2
Option 2: B(+1) = {10,2,3}; # of different values = 3; Discarded because does not satisfy the condition of different values
Are the numbers consecutive? NO.

Therefore, Insufficient.

Statement 2: At least one value occurs more than once in the list.
Set B = {10,2,2} satisfies the condition here, so I took that. But it does not have 2 consecutive integers. So, the answer to the question is NO.
and also, C = {10, 2,2,3,3}. It has 2 consecutive integers. So, YES.
Insufficient

Statement 1) and 2) together:
B = {10,2,2}; # of different values = 2
And, B(+1) = {11,2,2}; # of different values = 2
Are the numbers consecutive? NO.

C = {10, 2,2,3,3}; # of different values = 3
C (+1) = {11,2,2,3,3}; # of different values = 3
Are the numbers consecutive? YES.

Still insufficient.

Please explain where did I go wrong? Thanks.


Note statement 1: If any single value in the list is increased by 1, the number of different values in the list does not change.

No matter which single value you increase by 1, the number of different values in the list will not change.

So if you have a set (10, 2, 4) - 3 distinct values, No consecutive numbers
Increase 10 by 1, you get (11, 2, 4) - 3 distinct values
Increase 2 by 1, you get (10, 3, 4) - 3 distinct values
Increase 4 by 1, you get (10, 2, 5) - 3 distinct values
Satisfies.

So if you have a set (10, 2, 2, 3) - 3 distinct values, Consecutive numbers
Increase 10 by 1, you get (11, 2, 2, 3) - 3 distinct values
Increase either 2 by 1, you get (10, 2, 3, 3) - 3 distinct values
Increase 3 by 1, you get (10, 2, 2, 4) - 3 distinct values
Satisfies.

Statement 1 is not sufficient because the set may or may not have consecutive numbers. Both type of sets could satisfy the condition that number of distinct values always remains the same.

This is how you check which set does or does not satisfy our condition.
_________________

Karishma
Veritas Prep | GMAT Instructor
My Blog

Get started with Veritas Prep GMAT On Demand for $199

Veritas Prep Reviews

Intern
Intern
avatar
Joined: 25 Feb 2014
Posts: 17
Followers: 0

Kudos [?]: 0 [0], given: 15

Reviews Badge CAT Tests
Re: A list contains twenty integers, not necessarily distinct. [#permalink]

Show Tags

New post 17 Mar 2016, 12:03
Hi VeritasPrepKarishma,

When you consider statement 1 and statement 2 together, there can be two scenarios:

(i) 2, 2, 3, 7, 9 ---> 2, 3, 3, 7, 9
In this case if we increase 2 by one digit, both the statements are satisfied.

(ii) 2, 2, 4, 7, 9---> 2, 2, 5, 7, 9
If we read the statement 1 carefully, they have mentioned that ' If any single value in the list is increased by 1, the number of different values in the list does not change. '
So if we increase 4 here, the number of distinct numbers still dont change.

Since we get both yes and no as an answer, how can both the statements be sufficient??
Expert Post
Verbal Forum Moderator
Verbal Forum Moderator
User avatar
Joined: 02 Aug 2009
Posts: 4054
Followers: 274

Kudos [?]: 2828 [0], given: 98

Re: A list contains twenty integers, not necessarily distinct. [#permalink]

Show Tags

New post 17 Mar 2016, 15:57
kalyani7393 wrote:
Hi VeritasPrepKarishma,

When you consider statement 1 and statement 2 together, there can be two scenarios:

(i) 2, 2, 3, 7, 9 ---> 2, 3, 3, 7, 9
In this case if we increase 2 by one digit, both the statements are satisfied.

(ii) 2, 2, 4, 7, 9---> 2, 2, 5, 7, 9
If we read the statement 1 carefully, they have mentioned that ' If any single value in the list is increased by 1, the number of different values in the list does not change. '
So if we increase 4 here, the number of distinct numbers still dont change.

Since we get both yes and no as an answer, how can both the statements be sufficient??


Hi,
Quote:
If we read the statement 1 carefully, they have mentioned that ' If any single value in the list is increased by 1, the number of different values in the list does not change. '


ANY here means " if you pick up ANY value, it should not change the number of different values" MEANS each value should satisfy this condition..
(ii) 2, 2, 4, 7, 9---> 2, 2, 5, 7, 9
here the moment you increase 2,you will have the number of different values increased by 1..
But when you increase any single distinct value which does not have any of its neighbour number in the list, the number will remainthe same..

_________________

Absolute modulus :http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html

Expert Post
Veritas Prep GMAT Instructor
User avatar
Joined: 16 Oct 2010
Posts: 6916
Location: Pune, India
Followers: 1993

Kudos [?]: 12386 [0], given: 221

Re: A list contains twenty integers, not necessarily distinct. [#permalink]

Show Tags

New post 17 Mar 2016, 21:43
kalyani7393 wrote:
Hi VeritasPrepKarishma,

When you consider statement 1 and statement 2 together, there can be two scenarios:

(i) 2, 2, 3, 7, 9 ---> 2, 3, 3, 7, 9
In this case if we increase 2 by one digit, both the statements are satisfied.

(ii) 2, 2, 4, 7, 9---> 2, 2, 5, 7, 9
If we read the statement 1 carefully, they have mentioned that ' If any single value in the list is increased by 1, the number of different values in the list does not change. '
So if we increase 4 here, the number of distinct numbers still dont change.

Since we get both yes and no as an answer, how can both the statements be sufficient??


You cannot choose the value you increase by 1. It should hold for every value in the set.
When you increase a 2 by 1 in the case of 2, 2, 4, 7, 9, you will get 2, 3, 4, 7, 9. This increases the number of distinct numbers from 4 to 5.

"If any single value is increased by 1..." means it is applicable for every value in the list.
_________________

Karishma
Veritas Prep | GMAT Instructor
My Blog

Get started with Veritas Prep GMAT On Demand for $199

Veritas Prep Reviews

Intern
Intern
avatar
Joined: 29 Apr 2010
Posts: 2
Followers: 0

Kudos [?]: 0 [0], given: 3

GMAT ToolKit User
Re: A list contains twenty integers, not necessarily distinct. [#permalink]

Show Tags

New post 18 May 2016, 01:31
English is not my first language, so this is probably the main issue I have with this question. However, when I read the sentence "If any single value in the list is increased by 1, the number of different values in the list does not change" it is clear to me that what they are saying is:

that if in the original list there were 3 different values , after adding one to each value you should get 3 different values (regardless whether those numbers were in the original list - you only care about the number of different value within the set not when compared with the original set)

1,3,5 has 3 different values --> 2,4,6 has also 3 different values
1,2,4 has also 3 different values --> 2,3,5 has also 3 different values (the fact that 2 is in the original set and the resulting set is not relevant)

Please help! Am I crazy when I understand the problem this way. Is it poorly written or poorly understood
Re: A list contains twenty integers, not necessarily distinct.   [#permalink] 18 May 2016, 01:31
    Similar topics Author Replies Last post
Similar
Topics:
3 Experts publish their posts in the topic A list contains distinct integers a1, a2, …a10 arranged in ascending o whitehalo 2 28 Feb 2016, 00:46
1 Experts publish their posts in the topic List A contains 16 distinct odd integers and 9 distinct even integers duahsolo 4 28 Jan 2016, 04:58
34 Experts publish their posts in the topic A list contains n distinct integers. Are all n integers cons UdaySJha 20 11 Jan 2014, 01:18
16 If list S contains nine distinct integers, at least one of w Rock750 7 24 Jun 2013, 03:07
4 Set S contains exactly four distinct positive integers. Is t daviesj 4 07 Jan 2013, 06:42
Display posts from previous: Sort by

A list contains twenty integers, not necessarily distinct.

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.