ChaseDream

标题: TT GWD 1-2 [打印本页]

作者: rosierosie 时间: 2006-6-14 15:24
标题: TT GWD 1-2

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

答案是C,我觉得自己好像做过这个题但是今天怎么也想不起思路了！我查了讨论贴但是题号对不上。谢谢NN帮忙解答一下！！

谢谢！！

作者: kallyli 时间: 2006-6-14 16:43

P(3,3)*(1/3)^3=6*(1/27)=C

坐三个不同座位1/27的概率

三个座位排序,乘以6

作者: rosierosie 时间: 2006-6-14 20:41

哦对对，忘了排序了！天，这丢3落4的！

诚挚的感谢kallyli!!!

作者: 行缘 时间: 2006-6-15 13:41

另一种方法:

总的可能数:3x3x3=27

连坐的可能数:3x2=6

2/9

作者: jingle0915 时间: 2010-7-29 19:25
谢谢

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