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If a committee of 3 people is to be selected from among 5

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SVP
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Joined: 21 Jul 2006
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If a committee of 3 people is to be selected from among 5 [#permalink]

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New post 23 Jul 2008, 03:05
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If a committee of 3 people is to be selected from among 5 married couples so that the committee does not include two people who are married to each other, how many such committees are possible?

a) 20
b) 40
c) 50
d) 80
e) 120

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Director
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Joined: 27 May 2008
Posts: 541

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Re: PS: Combination [#permalink]

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New post 23 Jul 2008, 03:15
tarek99 wrote:
If a committee of 3 people is to be selected from among 5 married couples so that the committee does not include two people who are married to each other, how many such committees are possible?

a) 20
b) 40
c) 50
d) 80
e) 120


Refer below thread, you'll find at least 5 different ways :wink:
7-t67484

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Manager
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Joined: 03 Jun 2008
Posts: 134

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Schools: ISB, Tuck, Michigan (Ross), Darden, MBS
Re: PS: Combination [#permalink]

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New post 26 Jul 2008, 00:39
Lets first divide the 10 people into couples.

We will have five couples.

To select three unmarried people we chose 3 couples out of the five available and out of these three couples, we chose one person from each of these couples.

C(5,3)*2*2*2 = 80
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Kudos [?]: 45 [0], given: 0

Re: PS: Combination   [#permalink] 26 Jul 2008, 00:39
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If a committee of 3 people is to be selected from among 5

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