[問題]GWD02-25

[oneseven]

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

不知道怎麽算 幫幫忙 謝謝

[eced]

選三次車 可重覆, 三次全不同的機率
有牽涉到排列
選3次,每次有3種選擇,可重覆,所以共有3^3=27種選擇
三次全不同 3! =6
所以為6/27 =2/9