PREP模考一题

evelyn205205

On his drive to work, Leo listens to one of the three radio station, A,B or C. He first turns to A. If A is playing a song he likes, he listens to it; if not, he turns to B. If B is playing a song he likes, he listens to C. If C is playing a song he likes, he listens to C. If not, he turns off the radio. For each station, the probability is 0.3 that any given moment the station is playing a song Leo likes. On his drive to work, what is the probability that Leo will hear a song he likes.

A. 0.027

B. 0.09

C. 0.417

D. 0657

E. 0.9

ANSWER : D. 不会做。
求指教哦~谢谢各路牛牛！

Avengeryzc

1-0.7^3=0.657   减去关掉的可能即可

evelyn205205

THX!
那这道题的类型有点类似“求至少。。。有一种的概率”的题目吧