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

It is currently 25 Oct 2014, 08:14

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

Two members of a certain club are selected to speak at the

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
VP
VP
User avatar
Joined: 30 Jun 2008
Posts: 1048
Followers: 11

Kudos [?]: 291 [0], given: 1

Two members of a certain club are selected to speak at the [#permalink] New post 20 Sep 2008, 22:13
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Two members of a certain club are selected to speak at the next club meeting. If there are 36 different possible selections of the 2 club members, how many members does the club have?
_________________

"You have to find it. No one else can find it for you." - Bjorn Borg

Check out my GMAT blog - GMAT Tips and Strategies

VP
VP
User avatar
Joined: 30 Jun 2008
Posts: 1048
Followers: 11

Kudos [?]: 291 [0], given: 1

Re: PS: How many members ? [#permalink] New post 20 Sep 2008, 23:46
I did it this way.

we know total number of ways of selecting 2 People out of n people is nC2 = 36(given in the question)

ie n!/(2!*(n-2)!) = [n(n-1)*(n-2)!] / [(2!*(n-2)!)] = n(n-1)/2

so n(n-1)/2=36
n(n-1)=72
we know 72 = 9*8

so n=9

is the approach right ?
_________________

"You have to find it. No one else can find it for you." - Bjorn Borg

Check out my GMAT blog - GMAT Tips and Strategies

SVP
SVP
avatar
Joined: 17 Jun 2008
Posts: 1578
Followers: 12

Kudos [?]: 186 [0], given: 0

Re: PS: How many members ? [#permalink] New post 22 Sep 2008, 00:52
amitdgr wrote:
I did it this way.

we know total number of ways of selecting 2 People out of n people is nC2 = 36(given in the question)

ie n!/(2!*(n-2)!) = [n(n-1)*(n-2)!] / [(2!*(n-2)!)] = n(n-1)/2

so n(n-1)/2=36
n(n-1)=72
we know 72 = 9*8

so n=9

is the approach right ?


I used exactly the same approach.
Re: PS: How many members ?   [#permalink] 22 Sep 2008, 00:52
    Similar topics Author Replies Last post
Similar
Topics:
Experts publish their posts in the topic Two members of a club are to be selected to represent the arnijon90 2 10 May 2012, 07:15
The members of a club were asked whether they speak marcodonzelli 8 27 Nov 2007, 09:52
The members of a club were asked whether they speak kevincan 10 05 Aug 2007, 03:32
Two members of a club are to be selected to represent the g1m2a3t406 2 24 Oct 2006, 16:16
Two members of a club are to be selected to represent the alimad 6 17 Sep 2006, 16:22
Display posts from previous: Sort by

Two members of a certain club are selected to speak at the

  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®.