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? 答案是2/9，希望各位童鞋告知怎么解的，谢谢啦
a passenger is equally likely to ride in any 1 of the 3 cars each time that passenger rides the roller coaster三次乘车每次三种选择 所以分母是3的三次方 a certain passenger is to ride the roller coaster 3 times 每次乘车只有一种选择 没有告知顺序 所以分子式a33
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发表于 2011-9-27 17:48:39
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