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?
20
40
50
80
120
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相当于是运用了乘法原理来做的
cool，我跟你一个方法，看到你的评论我放心了很多登录 或 注册 后可以参加讨论