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标题: GWD-1的排列组合题1 [打印本页]

作者: anita_tian 时间: 2009-11-2 21:55 标题: GWD-1的排列组合题1

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 probablity 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: James 时间: 2009-11-3 23:27

题目就不翻译了

乘客随机坐3次，那么所乘坐的车厢的组合一共有 3*3*3种

而乘客遍历3个车厢的组合一共有 P 3 3种

所以最后的概率为 P 3 3 / 3*3*3 = 2/9

希望这个解答能帮到你

作者: anita_tian 时间: 2009-11-4 21:09

这道题容易想成 3/9

明白了

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