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标题: 数学题求助 [打印本页]

作者: qiuqiaomm 时间: 2006-12-19 06:49 标题: 数学题求助

Q31:

There are 5 cars to be displayed in 5 parking spaces with all the cars facing the same direction. Of the 5 cars, 3 are red, 1 is blue, and 1 is yellow. If the cars are identical except for color, how many different display arrangements of the 5 cars are possible?

A. 20

B. 25

C. 40

D. 60

E. 125

指点一下？

作者: yaojianbin33 时间: 2006-12-19 09:18

只需要为blue和yellow各选一个位置就行了，C(5,1)*C(4,1)=20

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