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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关于排除couple：草稿纸上写着5*8， 要想选couple，前两个人（即couple）有5种选法，第三个人在剩下的八个人里面选一个，所以是40. 2 married couple can be included in 5c1，no. of ways selecting a couple， * 8c1， no. of ways selecting the third person，=5 * 8=40
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关于排除couple：草稿纸上写着5*8，
要想选couple，前两个人（即couple）有5种选法，第三个人在剩下的八个人里面选一个，所以是40.
2 married couple can be included in 5c1，no. of ways selecting a couple， * 8c1， no. of ways selecting the third person，=5 * 8=40
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