概率题求解

vrtjtrj

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

小弟概率知识都不太记得了，这个怎么算的？

sdcar2010

There are three balls A, B, and C in the bag. Each time you retrieve a ball from the bag, and then put it back. What is the probability of having a combination of (ABC), not necessarily in that order, after three tries?

Total posibilities: 3*3*3 = 27

posibility with the combination of A, B, and C: 3! = 6

Probability = 6/27 = 2/9