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标题: gwd 21 17题 [打印本页]

作者: aster1990 时间: 2006-2-12 14:25 标题: gwd 21 17题

There are 5 cars to be displayed in 5 parking spaces with all the cars

facing the same direction. Of the 5 cars, 3 cars red, 1 is blue, and 1 is

yellow. If the cars are identical except for color （意思是相同颜色的车不能

放一块?), how many different display arrangements of the 5 cars all

possible?

key :20

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