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gwd 1-7 谢谢

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

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你的题目好怪呀,是问两个问题吗,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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