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标题: 一道GWD数学题 [打印本页]

作者: szgmater 时间: 2008-7-11 07:13 标题: 一道GWD数学题

Q2:

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

作者: nocturnetian 时间: 2008-7-12 08:37

C。一个人每辆车都坐一次，第一次选的时候三辆车都可以，几率为1，第二次选中剩下的两辆之一，几率2/3，同理最后一次选到剩下的一辆几率是1/3。然后把三次的几率相乘

作者: szgmater 时间: 2008-7-12 19:09

 多谢,明白了！~~~~~~~~~~

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