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

It is currently 18 Sep 2014, 08:04

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

M11 #1

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Manager
Manager
avatar
Joined: 25 May 2009
Posts: 145
Concentration: Finance
GMAT Date: 12-16-2011
Followers: 1

Kudos [?]: 42 [0], given: 2

M11 #1 [#permalink] New post 30 Jun 2009, 18:23
What is 1 + 2 + ... + 98 ?
A 4750
B 4763
C 4790
D 4801
E 4851

[Reveal] Spoiler:
OA=E
Manager
Manager
avatar
Joined: 30 Nov 2008
Posts: 86
Followers: 2

Kudos [?]: 14 [0], given: 0

GMAT ToolKit User
Re: M11 #1 [#permalink] New post 01 Jul 2009, 08:40
I got E

98+1=99, 97+2=99, 96+3.......There are 49 of these additions (98/2) so:

49*99=4851
Director
Director
User avatar
Joined: 04 Jan 2008
Posts: 919
Followers: 45

Kudos [?]: 167 [0], given: 17

GMAT Tests User
Re: M11 #1 [#permalink] New post 01 Jul 2009, 08:55
Its AP with a=1,d=1,n=98

hence S(n)=n/2[2a+(n-1)d]

its E
_________________

math-polygons-87336.html
competition-for-the-best-gmat-error-log-template-86232.html

Manager
Manager
avatar
Joined: 25 May 2009
Posts: 145
Concentration: Finance
GMAT Date: 12-16-2011
Followers: 1

Kudos [?]: 42 [0], given: 2

Re: M11 #1 [#permalink] New post 02 Jul 2009, 03:50
Figured out another way:

S = (n(Last+First))/2
n= (First-Last) + 1

n=98
S=(98(99))/2 = 4851 so E.
Re: M11 #1   [#permalink] 02 Jul 2009, 03:50
    Similar topics Author Replies Last post
Similar
Topics:
m11 q1 tusharvk 1 02 Dec 2009, 19:14
13 Experts publish their posts in the topic m11#30 georgechanhc 20 31 Dec 2008, 21:20
Experts publish their posts in the topic m11,#8 ritula 13 11 Nov 2008, 22:35
20 Experts publish their posts in the topic m11#9 amitdgr 9 01 Nov 2008, 07:23
2 M11 #03 dczuchta 2 01 Oct 2008, 14:20
Display posts from previous: Sort by

M11 #1

  Question banks Downloads My Bookmarks Reviews Important topics  

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®.