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

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If a committee of 3 people is to be selected from among 5 [#permalink] New post 26 Dec 2005, 08:53
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A
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D
E

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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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 [#permalink] New post 26 Dec 2005, 09:01
D. 80

1st member can be selected out of 10 people = 10
2nd member can be selected from 10 - 2 = 8 (remove first member and his/her spouse) = 8
3rd member : 10 - 4 = 6

total: 10 * 8 * 6
remove duplicates as order does not matter:
10 *8 * 6 / 3! = 80
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Re: DS- Committee 3 People - Tough one [#permalink] New post 26 Dec 2005, 12:17
TOUGH GUY 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


Answer is D

Total comb. for a committee of 3 - Total comb. a committee of 3 including a married couple

10C3 - (5C1*8C1)

120 - (5*8) = 80
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Re: DS- Committee 3 People - Tough one [#permalink] New post 26 Dec 2005, 16:40
TeHCM wrote:
Total comb. for a committee of 3 - Total comb. a committee of 3 including a married couple
=10C3 - (5C1*8C1)
=120 - (5*8) = 80


this is also my approach.......
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Explain [#permalink] New post 29 Dec 2005, 22:17
Total comb. for a committee of 3 - Total comb. a committee of 3 including a married couple

10C3 - (5C1*8C1)

Please elaborate 5C1*8C1 in the above explaination?
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Re: Explain [#permalink] New post 29 Dec 2005, 22:21
Yogendras wrote:
Total comb. for a committee of 3 - Total comb. a committee of 3 including a married couple

10C3 - (5C1*8C1)

Please elaborate 5C1*8C1 in the above explaination?


There are 5 couples and I want to know how many ways I could pick out one couple....thus 5C1.

Since two couples are picked, I want to know how many ways I could pick the 1 out of the people that's left...thus (10-2)C1
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Re: Explain   [#permalink] 29 Dec 2005, 22:21
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