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?（答案：D）
10!/(3!7!)- 5* 8!/(7!1!) random choosing 3 people from 5 couples(10people)---all possibility deduction chance of include two people who are married to each other 5* other people randomly choosing 1 people from remainder 8 people
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发表于 2010-8-22 22:11:50
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