Problem Solving
试题详情
题目：
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?
选项:
A、20
B、25
C、40
D、60
E、125
答案:
A
提问：
there r 5cars to be displayed in 5 parking spaces with all the cars facing the same direction,of the 5 cars,3 r red,1 is blue,1 is yellow,if the cars are identical except for color,how many different display arrangements of the 5 cars are possible?
.20
.25
.40
.60
.125
老师，完全没有思路。
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