[讨论]天山6-2

Q2:
A certain roller coaster has 3 cars ,and a single passenger is equally likely to ride in any 1 of the 3 cars each time that passenger riders the roller coaster.If a certain passenger is to rider the roller coaster 3 times, what is the probability that the passenger will ride in each of the 3 cars?
A 0
B1/9
C2/9
D1/3
E1

the answer is C.but i am puzzling!

P(3,3)/3^3..

分母是每次都有三種選擇, 總共有三次,,

分子是每次都要不一樣,,一共三種

想 测试一下 数学，结果大吃一惊 。。

作天山 6 ， 37道题，竟然 错了16个。郁闷坏了。

Q2: A certain roller coaster has 3 cars ,and a single passenger is equally likely to ride in any 1 of the 3 cars each time that passenger riders the roller coaster.If a certain passenger is to rider the roller coaster 3 times, what is the probability that the passenger will ride in each of the 3 cars? A 0 B1/9 C2/9 D1/3 E1

the answer is C.but i am puzzling!

这道题 怎么回事 ？