Acertain roller coaster has 3 cars, and a passenger is equally likely to ride inany 1 of the 3 cars each time that passenger rides the roller coaster. If a certain passenger is to ride the rollercoaster 3 times, what is the probability that the passenger will ride in eachof the 3 cars?
0
~$\frac{1}{9}$~
~$\frac{2}{9}$~
~$\frac{1}{3}$~
1
这是排列组合里的排列,看顺序的。
登录 或 注册 后可以参加讨论