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标题: gwd 1-7 谢谢 [打印本页]

作者: qwrersaa 时间: 2004-12-3 18:22 标题: gwd 1-7 谢谢

A certain univercity will celect 1 of 7 candidates eligible to fill a position in the mathematics department and 2 of 10 candidates eligible to fil 2 identical positions in the computer science department. If none of the candidates is eligible for a position in both departments, how many different sets of 3 candidates are there to fill the 3 position?

a42

b70

c 140

d 165

e315

作者: himba 时间: 2004-12-3 18:29

两个问题问的好像是一件事how many different sets of 3 candidates are there to fill the 3 positions? 是C17×C210＝315

我选E

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