400-1816-180
本題由chris提供
A certain roller coaster has 3 cars, and a passenger
A 0
B 1/9
C 2/9
D 1/3
E 1
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答案：
C
第一次從3?
?車里挑中任意一輛車的概率是3/3 第二次從剩下2輛車里挑中任意一輛車的概率是2/3 第三次從挑中最后一輛車的概率是1/3 所以三次不重復的概率是3/3*2/3*1/3=2/9 
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