It is currently 17 Oct 2017, 03:12

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.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

If sequences S has 240 terms, what is the 239th term of S?

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

Hide Tags

7 KUDOS received
Intern
Intern
avatar
Joined: 03 Jan 2011
Posts: 2

Kudos [?]: 71 [7], given: 0

If sequences S has 240 terms, what is the 239th term of S? [#permalink]

Show Tags

New post 29 Sep 2013, 19:57
7
This post received
KUDOS
31
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

59% (00:41) correct 41% (00:35) wrong based on 1109 sessions

HideShow timer Statistics

If sequences S has 240 terms, what is the 239th term of S?

1) Each term of S after the first term is 4 less than the preceding term
2) The 239th term of S is 952 less than the first term
[Reveal] Spoiler: OA

Kudos [?]: 71 [7], given: 0

Expert Post
15 KUDOS received
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 41871

Kudos [?]: 128512 [15], given: 12179

If sequences S has 240 terms, what is the 239th term of S? [#permalink]

Show Tags

New post 29 Sep 2013, 23:41
15
This post received
KUDOS
Expert's post
13
This post was
BOOKMARKED
If sequences S has 240 terms, what is the 239th term of S?

(1) Each term of S after the first term is 4 less than the preceding term. We have an evenly spaced set (arithmetic progression) but we need to know any term to answer the question. Not sufficient.

(2) The 239th term of S is 952 less than the first term. Clearly insufficient.

(1)+(2) The second statement can be derived from the first, so we have no new info. Basically we only know that the sequence is an arithmetic progression with common difference of 4. Not sufficient.

Answer: E.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

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?
Extra-hard Quant Tests with Brilliant Analytics

Kudos [?]: 128512 [15], given: 12179

GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 09 Sep 2013
Posts: 16764

Kudos [?]: 273 [0], given: 0

Premium Member
Re: If sequences S has 240 terms, what is the 239th term of S? [#permalink]

Show Tags

New post 12 Nov 2014, 03:35
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

Kudos [?]: 273 [0], given: 0

Intern
Intern
avatar
Joined: 27 May 2012
Posts: 2

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

Re: If sequences S has 240 terms, what is the 239th term of S? [#permalink]

Show Tags

New post 03 Jan 2015, 06:41
1
This post was
BOOKMARKED
Hi Bunuel and all,

I know OA says E, I don't think I'm wrong either unless my understanding is...

thus consider/ please correct my understanding for this sentence. Because it seems to me that with arithmetic progression -consecutive progression and the term made known, then only can the answer be found.

My answer was C, because we know that is an arithmetic progression and the first and 239th term is 952. Therefore 1st, 2nd,....239th term => 952/238 = 4. Therefore 1st to 240th term is 1st term + the arithmetic progression difference = 4 + 956 = 960.

GKA

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

Expert Post
2 KUDOS received
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 41871

Kudos [?]: 128512 [2], given: 12179

Re: If sequences S has 240 terms, what is the 239th term of S? [#permalink]

Show Tags

New post 05 Jan 2015, 04:03
2
This post received
KUDOS
Expert's post
1
This post was
BOOKMARKED
killgmatagain wrote:
Hi Bunuel and all,

I know OA says E, I don't think I'm wrong either unless my understanding is...

thus consider/ please correct my understanding for this sentence. Because it seems to me that with arithmetic progression -consecutive progression and the term made known, then only can the answer be found.

My answer was C, because we know that is an arithmetic progression and the first and 239th term is 952. Therefore 1st, 2nd,....239th term => 952/238 = 4. Therefore 1st to 240th term is 1st term + the arithmetic progression difference = 4 + 956 = 960.

GKA


(2) says that the difference between 239th term and the first term is 952. This is true for ANY evenly spaced set with the common difference of 4.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

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?
Extra-hard Quant Tests with Brilliant Analytics

Kudos [?]: 128512 [2], given: 12179

1 KUDOS received
Verbal Forum Moderator
Verbal Forum Moderator
User avatar
Joined: 29 Apr 2015
Posts: 894

Kudos [?]: 1798 [1], given: 302

Location: Switzerland
Concentration: Economics, Finance
Schools: LBS MIF '19
WE: Asset Management (Investment Banking)
GMAT ToolKit User Premium Member
Re: If sequences S has 240 terms, what is the 239th term of S? [#permalink]

Show Tags

New post 11 Oct 2015, 07:38
1
This post received
KUDOS
Bunuel wrote:
If sequences S has 240 terms, what is the 239th term of S?

(1) Each term of S after the first term is 4 less than the preceding term. We have an evenly spaced set (arithmetic progression) but we need to know any term to answer the question. Not sufficient.

(2) The 239th term of S is 952 less than the first term. Clearly insufficient.

(1)+(2) The second statement can be derived from the first, so we have no new info. Basically we only know that the sequence is an arithmetic progression with common difference of 4. Not sufficient.

Answer: E.


To get this right:

(1) Statement 1 says: \(A_N = A_{N-1}-4\). The question asks for \(A_{239}=?\). So all we needed to solve was one of the real values values such as \(A_{50}\) or any other?

Can you confirm this Bunuel?
_________________

Saving was yesterday, heat up the gmatclub.forum's sentiment by spending KUDOS!

PS Please send me PM if I do not respond to your question within 24 hours.

Kudos [?]: 1798 [1], given: 302

Expert Post
1 KUDOS received
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 41871

Kudos [?]: 128512 [1], given: 12179

Re: If sequences S has 240 terms, what is the 239th term of S? [#permalink]

Show Tags

New post 11 Oct 2015, 07:43
1
This post received
KUDOS
Expert's post
reto wrote:
Bunuel wrote:
If sequences S has 240 terms, what is the 239th term of S?

(1) Each term of S after the first term is 4 less than the preceding term. We have an evenly spaced set (arithmetic progression) but we need to know any term to answer the question. Not sufficient.

(2) The 239th term of S is 952 less than the first term. Clearly insufficient.

(1)+(2) The second statement can be derived from the first, so we have no new info. Basically we only know that the sequence is an arithmetic progression with common difference of 4. Not sufficient.

Answer: E.


To get this right:

(1) Statement 1 says: \(A_N = A_{N-1}-4\). The question asks for \(A_{239}=?\). So all we needed to solve was one of the real values values such as \(A_{50}\) or any other?

Can you confirm this Bunuel?

_________
Yes, that's right.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

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?
Extra-hard Quant Tests with Brilliant Analytics

Kudos [?]: 128512 [1], given: 12179

1 KUDOS received
Intern
Intern
avatar
Joined: 25 Jul 2012
Posts: 20

Kudos [?]: 2 [1], given: 8

Re: If sequences S has 240 terms, what is the 239th term of S? [#permalink]

Show Tags

New post 29 Oct 2015, 07:30
1
This post received
KUDOS
Bunuel wrote:
If sequences S has 240 terms, what is the 239th term of S?

(1) Each term of S after the first term is 4 less than the preceding term. We have an evenly spaced set (arithmetic progression) but we need to know any term to answer the question. Not sufficient.

(2) The 239th term of S is 952 less than the first term. Clearly insufficient.

(1)+(2) The second statement can be derived from the first, so we have no new info. Basically we only know that the sequence is an arithmetic progression with common difference of 4. Not sufficient.

Answer: E.


Need your help in correcting my understanding.

1. Each term of S after the first term is 4 less than the preceding term
2. The 239th term of S is 952 less than the first term

If first term = a, second term = a-4, so common difference = -4 (from 1).
tn = a + (n-1)d so we can write: a-952 = a + (239-1)d
1+2
a-952 = a + (239-1) (-4),we will find a and then we can find 239th term. Please help me understand where exactly I am unable to interpret the statements correctly.

Kudos [?]: 2 [1], given: 8

2 KUDOS received
BSchool Forum Moderator
avatar
B
Joined: 30 Dec 2015
Posts: 186

Kudos [?]: 101 [2], given: 98

Location: United States
Concentration: Strategy, Organizational Behavior
GPA: 3.88
WE: Business Development (Hospitality and Tourism)
Reviews Badge
If sequences S has 240 terms, what is the 239th term of S? [#permalink]

Show Tags

New post 11 Jan 2016, 13:27
2
This post received
KUDOS
1
This post was
BOOKMARKED
gauraku wrote:
Bunuel wrote:
If sequences S has 240 terms, what is the 239th term of S?

(1) Each term of S after the first term is 4 less than the preceding term. We have an evenly spaced set (arithmetic progression) but we need to know any term to answer the question. Not sufficient.

(2) The 239th term of S is 952 less than the first term. Clearly insufficient.

(1)+(2) The second statement can be derived from the first, so we have no new info. Basically we only know that the sequence is an arithmetic progression with common difference of 4. Not sufficient.

Answer: E.


Need your help in correcting my understanding.

1. Each term of S after the first term is 4 less than the preceding term
2. The 239th term of S is 952 less than the first term

If first term = a, second term = a-4, so common difference = -4 (from 1).
tn = a + (n-1)d so we can write: a-952 = a + (239-1)d
1+2
a-952 = a + (239-1) (-4),we will find a and then we can find 239th term. Please help me understand where exactly I am unable to interpret the statements correctly.


Hi Gauraku- I had a similar idea at first but I believe you're overcomplicating. One of the key ideas I always try to keep in mind is: how is the GMAT trying to trick me? What does it want me to believe? In this case, the GMAT wants you to think exactly as you have. However, when you simplify your equation, a = 0. While this could be a value of the first term, the first term could also equal 1000 and the 239th term equal 8 OR the first term could equal 10000 and 239th term equal 9,048. All three of these pairs follow the rule of being 4 less than the preceding term.

The main idea is that when we divide 952 by 4, we get 238, meaning that the 238th term is -4*238 less than the 1st- this does not give any new information since we already know all terms are spaced 4 apart from statement 1.

Kudos [?]: 101 [2], given: 98

Intern
Intern
avatar
Joined: 14 Jul 2014
Posts: 16

Kudos [?]: 6 [0], given: 10

GMAT ToolKit User
Re: If sequences S has 240 terms, what is the 239th term of S? [#permalink]

Show Tags

New post 27 May 2016, 08:09
Thanks you guys. Cleared my head.

Kudos [?]: 6 [0], given: 10

GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 09 Sep 2013
Posts: 16764

Kudos [?]: 273 [0], given: 0

Premium Member
Re: If sequences S has 240 terms, what is the 239th term of S? [#permalink]

Show Tags

New post 11 Jun 2017, 00:35
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

Kudos [?]: 273 [0], given: 0

Expert Post
Top Contributor
SVP
SVP
User avatar
G
Joined: 12 Sep 2015
Posts: 1793

Kudos [?]: 2443 [0], given: 356

Location: Canada
Re: If sequences S has 240 terms, what is the 239th term of S? [#permalink]

Show Tags

New post 11 Jun 2017, 07:04
Expert's post
Top Contributor
2
This post was
BOOKMARKED
teeva wrote:
If sequences S has 240 terms, what is the 239th term of S?

1) Each term of S after the first term is 4 less than the preceding term
2) The 239th term of S is 952 less than the first term


IMPORTANT: Statement 2 can be directly inferred from statement 1.
That is, if each term is 4 less than the previous term (e.g., 19, 15, 11, etc) then we can conclude that term2 will be 4 less than term1.
We can also conclude that term3 will be 8 less than term1, and:
term4 will be 12 less than term1.
term5 will be 16 less than term1.
.
.
.
term239 will be 952 less than term1 (same as statement 2).

So, as you can see, statement 2 DOES NOT PROVIDE ANY EXTRA INFORMATION beyond the information that statement 1 provided.

So, if statement 1 is NOT SUFFICIENT (which is clearly the case), then statement 2 cannot be NOT SUFFICIENT.
More importantly, the statements combined are NOT SUFFICIENT.

Answer:
[Reveal] Spoiler:
E


RELATED VIDEO

_________________

Brent Hanneson – Founder of gmatprepnow.com

Image

Kudos [?]: 2443 [0], given: 356

Intern
Intern
avatar
B
Joined: 14 Oct 2016
Posts: 30

Kudos [?]: 6 [0], given: 147

Location: India
WE: Sales (Energy and Utilities)
Premium Member
Re: If sequences S has 240 terms, what is the 239th term of S? [#permalink]

Show Tags

New post 12 Sep 2017, 12:46
If sequences S has 240 terms, what is the 239th term of S?

1) Each term of S after the first term is 4 less than the preceding term
2) The 239th term of S is 952 less than the first term

When solving such type of questions always think what is required to get the value of 239 Term

If we know how the series is formed, or if we are given the certain relationship between terms, or are the terms of the seq repetitive or is some kind of pattern in these terms.

So stmt 1 : Gives us how the seq is formed.

It says ( Xn)= (Xn-1) -4. This means the seq is an AP.

So 239 term will be X239= (Xn-1)+ (239-1) (-4)
so we are given X 239= X(n-1)-952.
So we need to find the value of Xn-1 to get the value of X239

Stmt 2: This is what has been derived from STMT 1

So We cannot find the value if required term till we have at least value of Xn-1 or any other term of the seq.
_________________

Abhimanyu

Kudos [?]: 6 [0], given: 147

Re: If sequences S has 240 terms, what is the 239th term of S?   [#permalink] 12 Sep 2017, 12:46
Display posts from previous: Sort by

If sequences S has 240 terms, what is the 239th term of S?

  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 | Emoji artwork provided by EmojiOne

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®.