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

It is currently 24 Jul 2014, 19:51

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

m04 Q2

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
1 KUDOS received
Manager
Manager
avatar
Joined: 11 Nov 2008
Posts: 85
Followers: 1

Kudos [?]: 5 [1] , given: 3

m04 Q2 [#permalink] New post 09 Dec 2008, 20:07
1
This post received
KUDOS
Is integer N even?

1. N^2 = N
2. N = N^3

[Reveal] Spoiler: OA
E

Source: GMAT Club Tests - hardest GMAT questions

My answer is D but the answer from the system is E, how is this possible?

Both statement will give us 1 or 0 in which neither is even and it's sufficient to answer the problem.

Someone please enlighten me
Kaplan Promo CodeKnewton GMAT Discount CodesVeritas Prep GMAT Discount Codes
2 KUDOS received
Intern
Intern
avatar
Joined: 25 Nov 2008
Posts: 7
Followers: 1

Kudos [?]: 10 [2] , given: 0

Re: m04 Q2 [#permalink] New post 09 Dec 2008, 20:37
2
This post received
KUDOS
U r correct. It can be 1 or 0 in each statement and both statements together.

Since we cant COME TO A CONCLUSION IF ITS EVEN(0) OR ODD(1) its INSUFF

E)
1 KUDOS received
Manager
Manager
avatar
Joined: 11 Nov 2008
Posts: 85
Followers: 1

Kudos [?]: 5 [1] , given: 3

Re: m04 Q2 [#permalink] New post 09 Dec 2008, 20:40
1
This post received
KUDOS
cramya wrote:
U r correct. It can be 1 or 0 in each statement and both statements together.

Since we cant COME TO A CONCLUSION IF ITS EVEN(0) OR ODD(1) its INSUFF

E)


Well my point exactly (although we come to a different conclusion at that). Considering that we don't really need a specific value in this question so long as we can determine whether N is even or not right?
1 KUDOS received
SVP
SVP
User avatar
Joined: 30 Apr 2008
Posts: 1893
Location: Oklahoma City
Schools: Hard Knocks
Followers: 28

Kudos [?]: 424 [1] , given: 32

GMAT Tests User
Re: m04 Q2 [#permalink] New post 09 Dec 2008, 22:21
1
This post received
KUDOS
A = Statement 1 is sufficient while Statement 2 is not sufficient.
B = Statement 2 is sufficient while Statement 1 is not sufficient
C = Statements 1 and 2 together are sufficient while NEITHER statement ALONE is sufficient
D = Both Statements 1 and 2 are sufficient (independent of the other)
E = Together, Statements 1 and 2 are NOT sufficient.

The answer cannot be D because when Statement 1 is Insufficient, the only possible answer choices left is B, C or E. D is not even an option because A requires #1 to be sufficient and D requires #1 to be sufficient independently of #2.

#1 is insufficient because N^2 will only be equal to N when N = 0 or +1. Because of this, we do not know if N is even because 0 is even, but +1 is odd.

I believe the answer should be E because # is insufficient also.

N could be 1, 0 or even -1. Same thing as #1...even & odd possibilities means that we cannot give a definite answer.

Together will not help because we have 0 and 1 as options for both Statements.

ozzie123 wrote:
Hello,

Is integer integer N even?

1. N^2 = N
2. N = N^3

My answer is D but the answer from the system is E, how is this possible?

Both statement will give us 1 or 0 in which neither is even and it's sufficient to answer the problem.

Someone please enlighten me

_________________

------------------------------------
J Allen Morris
**I'm pretty sure I'm right, but then again, I'm just a guy with his head up his a$$.

Get the best GMAT Prep Resources with GMAT Club Premium Membership

5 KUDOS received
Manager
Manager
avatar
Joined: 14 Oct 2008
Posts: 160
Followers: 1

Kudos [?]: 24 [5] , given: 0

Re: m04 Q2 [#permalink] New post 09 Dec 2008, 22:37
5
This post received
KUDOS
ozzie123 wrote:
Hello,

Is integer integer N even?

1. N^2 = N
2. N = N^3

My answer is D but the answer from the system is E, how is this possible?

Both statement will give us 1 or 0 in which neither is even and it's sufficient to answer the problem.

Someone please enlighten me


0 is Even , thats were you are getting confused.
1 KUDOS received
Manager
Manager
avatar
Joined: 11 Nov 2008
Posts: 85
Followers: 1

Kudos [?]: 5 [1] , given: 3

Re: m04 Q2 [#permalink] New post 09 Dec 2008, 23:05
1
This post received
KUDOS
gameCode wrote:

0 is Even , thats were you are getting confused.


Ah gameCode, thank you!
Intern
Intern
avatar
Joined: 12 Feb 2010
Posts: 5
Schools: ISB, HBS, LSB, Johnson
Followers: 0

Kudos [?]: 4 [0], given: 0

Re: m04 Q2 [#permalink] New post 18 Feb 2010, 01:26
Well, its not a great question i think. -1.
1 KUDOS received
Intern
Intern
avatar
Joined: 21 Dec 2010
Posts: 2
Followers: 0

Kudos [?]: 1 [1] , given: 0

Re: m04 Q2 [#permalink] New post 18 Feb 2011, 05:34
1
This post received
KUDOS
St. 1:
N^2 = N
N^2 - N = 0
N ( N-1)= 0

N= 0 or 1 (not sufficient)

St. 2:
N= N^3
N - N^3 = 0
N (1 - N^2) = 0
N (1-N) (1+N) = 0

N= 0 or 1 or -1 (not sufficient)

Combining 1 and 2
N= 0 or 1

Answer: E
Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 18729
Followers: 3240

Kudos [?]: 22363 [0], given: 2615

Re: m04 Q2 [#permalink] New post 18 Feb 2011, 05:58
Expert's post
First note that: zero is an even integer.

An even number is an integer that is "evenly divisible" by 2, i.e., divisible by 2 without a remainder.
An even number is an integer of the form n=2k, where k is an integer.

So for k=0 --> n=2*0=0.

As for the question:

Is integer N even?

(1) N^2 = N --> n(n-1)=0 --> either n=0=even or n=1=odd. Not sufficient.
(2) N^3 = N --> n(n-1)(n+1)=0 --> n=0=even or n=1=odd or n=-1=odd. Not sufficient.

(1)+(2) n can still be zero, so even or 1, so odd. Not sufficient.

Answer: E.

For more on number properties check: math-number-theory-88376.html

Hope it helps.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
25 extra-hard Quant Tests

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Senior Manager
Senior Manager
User avatar
Joined: 08 Nov 2010
Posts: 422
WE 1: Business Development
Followers: 7

Kudos [?]: 32 [0], given: 161

GMAT ToolKit User GMAT Tests User
Re: m04 Q2 [#permalink] New post 18 Feb 2011, 06:04
i understand this question perfectly and i got it right,

but how come, if i decide to divide both sides with N - it should keep the value the same.

but i would get N=1 only.

can someone make it clearer for me?

why cant i divide all in N and still get the full answer?

thanks.
_________________

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 18729
Followers: 3240

Kudos [?]: 22363 [0], given: 2615

Re: m04 Q2 [#permalink] New post 18 Feb 2011, 06:11
Expert's post
144144 wrote:
i understand this question perfectly and i got it right,

but how come, if i decide to divide both sides with N - it should keep the value the same.

but i would get N=1 only.

can someone make it clearer for me?

why cant i divide all in N and still get the full answer?

thanks.


Never reduce equation by variable (or expression with variable), if you are not certain that variable (or expression with variable) doesn't equal to zero. We can not divide by zero.

So when you divide by N you assume, with no ground for it, that N does not equal to zero thus exclude a possible solution.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
25 extra-hard Quant Tests

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Manager
Manager
avatar
Joined: 04 Dec 2009
Posts: 72
Location: INDIA
Followers: 2

Kudos [?]: 9 [0], given: 4

Re: m04 Q2 [#permalink] New post 18 Feb 2011, 19:52
ans E for both statment n=0 or 1
_________________

MBA (Mind , Body and Attitude )

Intern
Intern
avatar
Joined: 12 Jan 2011
Posts: 4
Followers: 0

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

Re: m04 Q2 [#permalink] New post 19 Feb 2011, 00:22
Yah, I see Sangya explained that question is exactly.
We can't choose the result if it has 2 numbers : 0 and 1.
So, E is OA
Manager
Manager
avatar
Joined: 10 Jan 2011
Posts: 244
Location: India
GMAT Date: 07-16-2012
GPA: 3.4
WE: Consulting (Consulting)
Followers: 0

Kudos [?]: 18 [0], given: 25

Reviews Badge
Re: m04 Q2 [#permalink] New post 20 Feb 2011, 09:49
My answer is E

as N can be 0 or 1
_________________

-------Analyze why option A in SC wrong-------

Manager
Manager
avatar
Joined: 02 Feb 2012
Posts: 195
Location: United States
GPA: 3.08
Followers: 1

Kudos [?]: 2 [0], given: 104

Re: m04 Q2 [#permalink] New post 22 Feb 2012, 13:17
I'm glad I had read that 0 was even before tackling this question. Knowing this makes the answer much more obvious.
Manager
Manager
User avatar
Joined: 27 Apr 2010
Posts: 107
Followers: 0

Kudos [?]: 11 [0], given: 23

GMAT ToolKit User GMAT Tests User
Re: m04 Q2 [#permalink] New post 23 Feb 2012, 20:13
we know: e*e=e, o*o=o
we also know: N^2 = N*N = e*e or o*o
N^3= N*N*N = e*e*e or o*o*o
this knocks out a,b,d automatically.

together it is: N^2 = N^3, so we know it's either 0 or 1/-1. 0 = even and 1 = d so...still doesn't solve.

E.
_________________

GOAL: 7xx

Senior Manager
Senior Manager
avatar
Joined: 10 Nov 2010
Posts: 268
Location: India
Concentration: Strategy, Operations
GMAT 1: 520 Q42 V19
GMAT 2: 540 Q44 V21
WE: Information Technology (Computer Software)
Followers: 5

Kudos [?]: 38 [0], given: 22

GMAT Tests User
Re: m04 Q2 [#permalink] New post 26 Feb 2012, 05:14
a) n^2=n
=> 0^2=0 or 1^2=1 as zero is even integer and and 1 is odd ---- NS
b) n= n^3
=> 0=0^3 or 1=1^3 as zero is even integer and and 1 is odd ----NS
a+b) NS

E
_________________

The proof of understanding is the ability to explain it.

Intern
Intern
avatar
Joined: 15 Apr 2011
Posts: 49
Followers: 0

Kudos [?]: 0 [0], given: 8

GMAT ToolKit User
Re: m04 Q2 [#permalink] New post 26 Feb 2013, 08:20
Yekrut wrote:
I'm glad I had read that 0 was even before tackling this question. Knowing this makes the answer much more obvious.


I have also made similar mistake in the past. Practice! Practice! Practice! is the key...
1 KUDOS received
Intern
Intern
avatar
Joined: 10 Aug 2012
Posts: 19
Location: India
Followers: 0

Kudos [?]: 5 [1] , given: 12

Re: m04 Q2 [#permalink] New post 26 Feb 2013, 21:25
1
This post received
KUDOS
As we know 0 is an even number.

Is integer N even?

(1) N^2 = N => N either 0 or 1.... Not sufficient.
(2) N^3 = N => N either 0 or 1.... Not sufficient.

(1)+(2) can still be zero, so even or 1, so odd. Not sufficient.

Answer: E.
1 KUDOS received
Intern
Intern
avatar
Status: VRAM
Joined: 07 Feb 2014
Posts: 5
Location: India
Concentration: Finance, Marketing
GMAT Date: 09-06-2014
WE: Consulting (Computer Software)
Followers: 0

Kudos [?]: 6 [1] , given: 1

Re: m04 Q2 [#permalink] New post 25 Feb 2014, 03:47
1
This post received
KUDOS
I guesss E for me

N=N^2 scenarios 0,1 bOTH odd and even

N=N^3 again 0 and 1 both odd and even

so cannot find even after combining hence E
Re: m04 Q2   [#permalink] 25 Feb 2014, 03:47
    Similar topics Author Replies Last post
Similar
Topics:
m04 bibha 1 12 Jul 2010, 03:49
7 Experts publish their posts in the topic M04 #1 dczuchta 26 22 Sep 2008, 18:48
15 Experts publish their posts in the topic M04 # 32 dczuchta 15 22 Sep 2008, 18:43
3 Experts publish their posts in the topic m04 Q23 vishy007 12 14 Sep 2008, 05:12
22 Experts publish their posts in the topic M04 #12 Tvisha 93 10 Aug 2008, 11:56
Display posts from previous: Sort by

m04 Q2

  Question banks Downloads My Bookmarks Reviews Important topics  

Go to page    1   2    Next  [ 21 posts ] 

Moderators: Bunuel, WoundedTiger



GMAT Club MBA Forum Home| About| Privacy Policy| 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®.