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
3次從3輛汽?
??中坐每次坐車不同：3*2*1
3次從3輛汽車中隨便坐：3*3*3
兩個(gè)一比，所以是2/9 
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