GWD2 Q25 求牛牛指点

默默楚 · 发表于 2012-4-5 16:53:08

Q25:

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

met24 · 发表于 2012-4-5 16:54:56

这题问的是一个人上三次火车，正好每辆车上一次的概率是多少。就是3/3 *2/3 *1/3=2/9~~

默默楚 · 发表于 2012-4-5 17:51:30

THANK YOU ~ 明白啦~

GWD2 Q25 求牛牛指点

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