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请教一道概率题

请教一道概率题
A certain roller coaster has 3 cars, 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 cars 3 times, what is the probability that the passenger will ride in each of the 3 cars? [em03]
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1/3^3 .

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怎么算出来的

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偶也不会算

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