Find all School-related info fast with the new School-Specific MBA Forum
Learn more about the recent changes... close

It is currently 21 May 2013, 22:07
Customize  |  Hide

Search
Register
New posts
Unanswered

There are 11 women and 9 men in a certain club. If the club

  Question banks Downloads My Bookmarks Reviews  
  Oldest Best Reply
Search for:
 
Print view
First unread post
Author Message
TAGS:
Senior Manager
Senior Manager
Joined: 02 Dec 2007
Posts: 461
Followers: 1

Kudos [?]: 19 [0], given: 6

GMAT Tests User
There are 11 women and 9 men in a certain club. If the club [#permalink] New post 07 Sep 2008, 10:08
00:00

Question Stats:

0% (00:00) correct 100% (00:50) wrong based on 0 sessions
There are 11 women and 9 men in a certain club. If the club is to select a committee of 2 women and 2 men, how many different such committees are possible?

A. 120
B. 720
C. 1,060
D. 1,520
E. 1,980
Manager
Manager
Joined: 28 Aug 2008
Posts: 102
Followers: 1

Kudos [?]: 3 [0], given: 0

Re: men and women [#permalink] New post 08 Sep 2008, 13:10
E

(11!/2!9!)*(9!/2!7!) = 1980
Manager
Manager
Joined: 14 Jun 2007
Posts: 172
Location: Vienna, Austria
Followers: 1

Kudos [?]: 5 [0], given: 0

GMAT Tests User
Re: men and women [#permalink] New post 06 Nov 2008, 00:40
guys
can some one tell my why in this case we multiply the 2 parts and do not add them up?
is there a general rule for either multiplying od adding up in permutations?

cheers
Manager
Manager
Joined: 08 Aug 2008
Posts: 235
Followers: 1

Kudos [?]: 13 [0], given: 0

GMAT Tests User
Re: men and women [#permalink] New post 06 Nov 2008, 00:46
Thats because its an "and" condition..and implies multiply...
if its an "OR" U have to add..

its simple to understand if ur familiar with Binary logic...
Manager
Manager
Joined: 19 Oct 2010
Posts: 242
Location: India
Concentration: Marketing, Finance
Schools: Booth '14, Ross '14, Yale '14, Fuqua '14, Kelley '14
GMAT 1: 560 Q36 V31
GPA: 3
Followers: 5

Kudos [?]: 10 [0], given: 21

GMAT Tests User
Re: men and women [#permalink] New post 11 Sep 2011, 03:35
Answer is E. Can somebody tell me what answer I may have found if I had added the 11C2 and 9C2 (55+36=91)?

I'm guessing that would've been the number of 2-member committees which had men and women separately. Is that right?
_________________

petrifiedbutstanding

Director
Director
Joined: 01 Feb 2011
Posts: 792
Followers: 11

Kudos [?]: 62 [0], given: 42

GMAT Tests User
Re: men and women [#permalink] New post 11 Sep 2011, 09:56
these are two independent events. meaning picking men from a group of men has no effect on picking women from group of women. so you have to multiply here.

11c2*9c2 =1980

Answer is E.


If you are trying to find possible number of 2 member committee then the answer would be
11c2+9c2+11c1*9c1 (you can pick 2M or 2W or 1M,1W)




petrifiedbutstanding wrote:
Answer is E. Can somebody tell me what answer I may have found if I had added the 11C2 and 9C2 (55+36=91)?

I'm guessing that would've been the number of 2-member committees which had men and women separately. Is that right?
Manager
Manager
Status: Prepping for the last time....
Joined: 28 May 2010
Posts: 202
Location: Australia
Concentration: Technology, Strategy
GMAT 1: 630 Q47 V29
GPA: 3.2
Followers: 0

Kudos [?]: 8 [0], given: 21

GMAT Tests User
Re: men and women [#permalink] New post 12 Sep 2011, 05:10
Independent events must always be multiplied to get the total combinations..

E is the answer..
_________________

Two great challenges: 1. Guts to Fail and 2. Fear to Succeed

Re: men and women   [#permalink] 12 Sep 2011, 05:10
    Similar topics Author Replies Last post
Similar
Topics:
 New posts There are 11 women and 9 men in a certain club. If the club Stormgal 3 17 Jan 2007, 07:56
New posts There are 11 women and 9 men in a certain club. If the club sidbidus 7 30 Aug 2007, 08:57
New posts EXPERTS_POSTS_IN_THIS_TOPIC There are 11 women and 9 men in a certain club. If the club marcodonzelli 3 06 Jan 2008, 08:51
New posts There are 11 women and 9 men in a certain club. If the club marcodonzelli 2 12 Jan 2008, 03:07
New posts There are 11 women and 9 men in a certain club. If the club Jcpenny 1 05 Nov 2008, 19:15
Display posts from previous: Sort by

There are 11 women and 9 men in a certain club. If the club

  Question banks Downloads My Bookmarks Reviews  
Print view
First unread post

Moderators: Bunuel, VeritasPrepKarishma, IanStewart

Search for:


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®.

Main navigation

GMAT Resources

Partners

MBA Resources

www.gmac.com|www.mba.com