[求助][原创]GWD1- Math2求教

adasuying2004

找了半天解答都找不到这道题。希望有心人帮我解答一下拉！！

A certain roller coaster has 3 cars, and a passenger is equally likely to ride in any 1 of the 3 cars each time that passenger rides the roller coaster.  If a certain passenger is to ride the roller coaster 3 times, what is the probability that the passenger will ride in each of the 3 cars?

 

A.       0

B.        1/9

C.        2/9

D.       1/3

E.        1

答案是C。完全没有思路。

oranachi

这道题目是说 有3种cars 一个人总共玩了3次 问你他三次都是玩不一样的car的概率是多少

分子：他玩了3次 每次有3种选择 3的3次方

分母：他玩了3次每次都是不一样的car 那么总共就有 3P3＝6 种玩法

所以 概率就是6/37＝2/9