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help--math pro [复制链接]

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发表于 2012-3-5 20:24:53 |显示全部楼层
If a committee of 3 people is to beselected from among 5 married couples so that the committee does not includetwo people who are married to each other, how many such committees arepossible?

A.
20
B.
40
C.
50
D.
80
E.
120
Answer:
------------------------------------------------------------------------------------------------------------
be around

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发表于 2012-3-6 10:25:30 |显示全部楼层
本帖最后由 MJ穿MJ 于 2012-3-6 10:27 编辑

???

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