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

It is currently 29 Jul 2015, 05:36
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

If the sum of the first n positive integers is S , what is

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Director
Director
User avatar
Joined: 21 Sep 2004
Posts: 612
Followers: 1

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

If the sum of the first n positive integers is S , what is [#permalink] New post 24 Jan 2005, 18:12
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If the sum of the first n positive integers is S , what is the sum of the first n positive even integers, in terms of S ?
(A) S/2
(B) S
(C) 2S
(D) 2S + 2
(E) 4S

Last edited by vprabhala on 24 Jan 2005, 18:15, edited 1 time in total.
Director
Director
User avatar
Joined: 07 Jun 2004
Posts: 614
Location: PA
Followers: 3

Kudos [?]: 328 [0], given: 22

 [#permalink] New post 24 Jan 2005, 18:14
Answer is A and C = 2S :-D

i know its a typo
Director
Director
User avatar
Joined: 21 Sep 2004
Posts: 612
Followers: 1

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

 [#permalink] New post 24 Jan 2005, 18:16
rxs0005 wrote:
Answer is A and C = 2S :-D

i know its a typo

can you please elaborate..
the way i approached it is n(n+1)/2 is the sum of first n +ve integers.. is that the way..
Director
Director
User avatar
Joined: 07 Jun 2004
Posts: 614
Location: PA
Followers: 3

Kudos [?]: 328 [0], given: 22

 [#permalink] New post 24 Jan 2005, 18:23
for this i just took sample numbers and chekce dthem twice with diff sets

it came 2S

is it right
VP
VP
avatar
Joined: 18 Nov 2004
Posts: 1441
Followers: 2

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

 [#permalink] New post 24 Jan 2005, 18:33
I am getting "D".....2S+2
Director
Director
User avatar
Joined: 07 Jun 2004
Posts: 614
Location: PA
Followers: 3

Kudos [?]: 328 [0], given: 22

 [#permalink] New post 24 Jan 2005, 18:38
If the sum of the first n positive integers is S , what is the sum of the first n positive even integers, in terms of S ?

let n = 5

1+2+3+4+5 = 15 = S

so first n positive intgers = 2 + 4 + 6 + 8 + 10 = 30 = 2S
VP
VP
avatar
Joined: 18 Nov 2004
Posts: 1441
Followers: 2

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

 [#permalink] New post 24 Jan 2005, 18:41
rxs0005 wrote:
If the sum of the first n positive integers is S , what is the sum of the first n positive even integers, in terms of S ?

let n = 5

1+2+3+4+5 = 15 = S

so first n positive intgers = 2 + 4 + 6 + 8 + 10 = 30 = 2S



:P ....calculation mistake....u r right it is 2S...my bad. :roll:...sum of first n even integers is n(n+1)...and sum of first n integers is n(n+1)/2
Director
Director
User avatar
Joined: 07 Jun 2004
Posts: 614
Location: PA
Followers: 3

Kudos [?]: 328 [0], given: 22

 [#permalink] New post 24 Jan 2005, 18:45
no sweat dude it happens just dont do it on the REAL DEAL !!! DAY !! :)
VP
VP
avatar
Joined: 18 Nov 2004
Posts: 1441
Followers: 2

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

 [#permalink] New post 24 Jan 2005, 18:51
rxs0005 wrote:
no sweat dude it happens just dont do it on the REAL DEAL !!! DAY !! :)


Who cares abt real deal day :twisted: ?? :-D
SVP
SVP
User avatar
Joined: 03 Jan 2005
Posts: 2246
Followers: 14

Kudos [?]: 230 [0], given: 0

 [#permalink] New post 24 Jan 2005, 20:41
S=1+2+3+4+...
S1=2+4+6+8+...=2(1+2+3+4+...)=2S

A
  [#permalink] 24 Jan 2005, 20:41
Display posts from previous: Sort by

If the sum of the first n positive integers is S , what is

  Question banks Downloads My Bookmarks Reviews Important topics  


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®.