我对概率问题很弱智，求教各位。

proteus

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

queeniemai

选C  2/9

3次坐的机会，一共3^3=27种情况

第一次C1 3,第二次剩下两个中选一C1 2,第三次最后一个没坐的C1 1,共是C1 3*C1 2*C1 1=6种

所以概率为6/27=2/9

proteus

非常感谢queeniemai！