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标题: gwd-5-3 [打印本页]

作者: 叮叮当当 时间: 2006-7-15 07:32 标题: gwd-5-3

Q3:

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? C¹₅C¹₄C¹₆

A. 20

B. 40

C. 50

D. 80

E. 120

the answer is D,mine is E

作者: yaojianbin33 时间: 2006-7-16 07:19

C(5,3)C(2,1)C(2,1)C(2,1)=80

作者: 叮叮当当 时间: 2006-7-20 20:18

thanks !!!!!!

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