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标题: 一道排列组合题--GWD1-7 [打印本页]

作者: thumbwings 时间: 2007-7-29 15:15 标题: 一道排列组合题--GWD1-7

A certain university will select 1 of 7 candidates eligible to fill a position in the mathematics department and 2 of 10 candidates eligible to fill 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 positions?

A. 42

B. 70

C. 140

D. 165

E.315

作者: sweatfly 时间: 2007-7-30 06:17

7*[(10*9)/2]=315

作者: lxj19820127 时间: 2007-7-30 14:04

 c(1,7)*c(2,10)=315

作者: thumbwings 时间: 2007-8-4 08:28

thank you !

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