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扑扑扑 · 2020年07月19日

问一道题:NO.PZ2018062016000078

问题如下:

A gourmet will rank 12 dishes of a famous restaurant from most delicious to least delicious. To find out the number of possible ranking ways, which principle of counting may be adopted?

选项:

A.

Permutation

B.

Labeling 

C.

Multiplication rule

解释:

A is correct. Considering the dishes will be arranged from most delicious to least delicious, the order of the dishes is important. Permutation means rearranging all the members of a set into some sequence or order, so the permutation formula should be adopted.

请问这题为什么是permutation呀?为什么不是factorial呀?

1 个答案
已采纳答案

星星_品职助教 · 2020年07月19日

同学你好,

“rank 12 dishes of a famous restaurant” 说明需要排序,同时from “most delicious to least delicious”说明这12个位置是有顺序的。有顺序的排序直接就是排列问题了,选A即可。如果考察计算,直接12P12就可以解决。

 

安在 · 2022年09月10日

但计算感觉就是阶乘诶

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老师您好

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