单选题In how many different ways can five pupils be seated in four chairs?A 20B 40C 60D 80E 120
题目
单选题
In how many different ways can five pupils be seated in four chairs?
A
20
B
40
C
60
D
80
E
120
相似考题
参考答案和解析
正确答案：
B
解析：
Any one of the five pupils can be seated in the first chair, any of the four remaining pupils in the second chair, any of the three remaining pupils in the third chair, and any of the remaining two pupils in the fourth chair. Thus, five pupils can be seated in four chairs in 5×4×3×2 or 120 different ways.
Any one of the five pupils can be seated in the first chair, any of the four remaining pupils in the second chair, any of the three remaining pupils in the third chair, and any of the remaining two pupils in the fourth chair. Thus, five pupils can be seated in four chairs in 5×4×3×2 or 120 different ways.