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标题: 请教GWD30-31? [打印本页]

作者: joezhouyun 时间: 2007-2-2 07:16 标题: 请教GWD30-31?

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

Answer:

答案为Ａ，请问如何解答？

作者: assurance 时间: 2007-2-2 20:13

不用考虑红车，先从5个车位中选一个放蓝车，在从剩下4个车位中选一个放黄车，5×4＝20

作者: joezhouyun 时间: 2007-2-3 20:18

i see, thank you !!!

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