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标题: [讨论]天山6-2 [打印本页]

作者: rengangjhq 时间: 2005-1-13 21:01
标题: [讨论]天山6-2

Q2:
A certain roller coaster has 3 cars ,and a single passenger is equally likely to ride in any 1 of the 3 cars each time that passenger riders the roller coaster.If a certain passenger is to rider the roller coaster 3 times, what is the probability that the passenger will ride in each of the 3 cars?
A 0
B1/9
C2/9
D1/3
E1

the answer is C.but i am puzzling!

作者: beautywawa 时间: 2005-1-13 21:08

P(3,3)/3^3..

分母是每次都有三種選擇, 總共有三次,,

分子是每次都要不一樣,,一共三種

作者: 爱维的天 时间: 2005-1-13 21:11
(3*2*1)/(3³)=2/9,三次分別不同車有3*2種,總共3³種坐車法...

作者: pengfei1102 时间: 2006-6-27 10:26

想测试一下数学，结果大吃一惊。。

作天山 6 ， 37道题，竟然错了16个。郁闷坏了。

Q2: A certain roller coaster has 3 cars ,and a single passenger is equally likely to ride in any 1 of the 3 cars each time that passenger riders the roller coaster.If a certain passenger is to rider the roller coaster 3 times, what is the probability that the passenger will ride in each of the 3 cars? A 0 B1/9 C2/9 D1/3 E1

the answer is C.but i am puzzling!

这道题怎么回事？

[此贴子已经被作者于2006-6-27 10:26:15编辑过]

作者: yaoyao99 时间: 2006-6-27 11:03
It's explained twice in this discussion. Which part are you still confused about?

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