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

It is currently 24 Oct 2014, 02:38

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

ps:sum

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
avatar
Joined: 22 Jun 2005
Posts: 364
Location: London
Followers: 1

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

ps:sum [#permalink] New post 26 May 2006, 13:08
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 100% (01:04) wrong based on 0 sessions
The sum of the first 50 positive even integers is 2550. What is the sum of the even integers from 102 to 200, inclusive?

1. 5100
2. 7550
3. 10100
4. 15500
5. 20100

Please explain your answers?
Senior Manager
Senior Manager
avatar
Joined: 09 Mar 2006
Posts: 445
Followers: 1

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

 [#permalink] New post 26 May 2006, 13:25
102 + 104 + ... + 200 = 100 * 50 + 2 * ( 1 + 2 + ... + 50 ) = 5000 + 2 * 2550 = 10100
Director
Director
avatar
Joined: 13 Nov 2003
Posts: 801
Location: BULGARIA
Followers: 1

Kudos [?]: 21 [0], given: 0

 [#permalink] New post 26 May 2006, 21:29
Here is my piece.
From 102 to 200 inclusive, there are 99 integers, 50 even and 49 odd. The sum of the first even and last even is
102+200=302
104+198=302
106+196=302 and so on you have got 25 pairs with sum 302 or 7550
Senior Manager
Senior Manager
avatar
Joined: 09 Mar 2006
Posts: 445
Followers: 1

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

 [#permalink] New post 26 May 2006, 23:44
BG wrote:
Here is my piece.
From 102 to 200 inclusive, there are 99 integers, 50 even and 49 odd. The sum of the first even and last even is
102+200=302
104+198=302
106+196=302 and so on you have got 25 pairs with sum 302 or 7550


You are right, I got the question wrong since 2550 is not the sum of
first 50 integers, but that of first 50 even integers ( 2+4+...+100 )

Well done!
Manager
Manager
avatar
Joined: 05 Jan 2006
Posts: 66
Followers: 1

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

 [#permalink] New post 27 May 2006, 02:39
I got B. Just add 100 to each of the previous 50 even integers. Since there are 50 terms, you add 5000 to the previous total, which makes B the logical answer.
  [#permalink] 27 May 2006, 02:39
    Similar topics Author Replies Last post
Similar
Topics:
PS: Sum tarek99 6 16 Nov 2008, 08:45
PS - sum of factorials querio 9 28 Apr 2007, 04:08
ps:sum macca 1 27 Mar 2006, 14:41
ps - sum + sum ? christoph 7 20 Oct 2005, 11:31
PS;: SUM mirhaque 3 15 Apr 2005, 06:52
Display posts from previous: Sort by

ps:sum

  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®.