[問題]GWD23-29

[magic]

Q29:
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
請問怎麼算出來的阿

[kwtluck]

(3/3)*(2/3)*(1/3)=6/27=2/9

第一次3部車中有3種選擇
第二次3部車中有2種選擇
第三次3部車中有1種選擇

[magic]

謝謝唷^^