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?
0
~$\frac{1}{9}$~
~$\frac{2}{9}$~
~$\frac{1}{3}$~
1
一共有3x3x3=27种可能性,三次上不同的车有3x2种可能性,所以是6/27=2/9
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