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标题: 天山4－18！请教！ [打印本页]

作者: piqiuwawa 时间: 2005-9-23 21:06 标题: 天山4－18！请教！

Q18:
Departments A, B, and C have 10 employees each, and department D has 20 employees.Departments A, B, C, and D have no employees in common. A task force is to be formed by selecting 1 employee from each of departments A, B, and C and 2 employees from department D. How many different task forces are possible?
A. 19,000
B. 40,000
C. 100,000
D. 190,000
E. 400,000

答案是D，请问怎么做的啊？

3x!

作者: jojofgasw 时间: 2005-9-23 21:43

c10,1*c10,1*c10,1*c20,2=10*10*10*190=190,000

D...

作者: piqiuwawa 时间: 2005-9-25 09:29

I got it !!!! thanks !!

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