It is currently 28 Jun 2017, 14:43

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# There are four distinct pairs of brothers and sisters. In

Author Message
Director
Joined: 20 Sep 2006
Posts: 653
There are four distinct pairs of brothers and sisters. In [#permalink]

### Show Tags

12 Sep 2008, 08:36
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

There are four distinct pairs of brothers and sisters. In how many ways can a committee of 3 be formed and NOT have siblings in it?

8
24
32
56
192
Senior Manager
Joined: 09 Oct 2007
Posts: 466

### Show Tags

12 Sep 2008, 08:48
32 = C:

(8*6*4) / 3! ==>

8 = 4 pairs of sibling to choose from for the first seat
6 = 3 pairs of sibling to choose from for the second seat
4 = 2 pairs of sibling to choose from for the second seat
_______________________________________________

3! = To get rid of the times you overcounted since order doesn't matter
Re: combination   [#permalink] 12 Sep 2008, 08:48
Display posts from previous: Sort by