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标题: 请教gwd6-3 [打印本页]

作者: ytrrew 时间: 2005-1-3 20:10 标题: 请教gwd6-3

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?

A. 20 B. 40 C. 50 D. 80 E. 120

作者: himba 时间: 2005-1-3 20:11

任选3个 C（3，10）

其中有一个是一对 C（1，5）C（1，8）

C（3，10）- C（1，5）C（1，8）=120-40=80

选D

作者: sammen 时间: 2005-1-3 20:52

严重同意。是任选3个人得选法减去有1对得可能。

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