GWD-5-3

doudou8

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

[此贴子已经被作者于2008-11-19 14:53:52编辑过]

windygirl

C(5,3)*2^3=80

夫妻只能一人参加，就是一家只能一人当选。从5对夫妻中选3对。至于是男方还是女方当，3对各自有2种选法。类似我国排列组合的“鞋子问题”