英语翻译A weighted coin is flipped three times with p(H)=1/3.wha

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英语翻译
A weighted coin is flipped three times with p(H)=1/3.what is the probability that heads come out exactly twice given heads come out at least once?

一枚硬币抛3次,每次正面朝上的几率是p（H）=1/3,考虑到至少会出现一次正面朝上的情况,正好出现2次正面朝上的几率有多少?
∵至少有一次是出现正面朝上,那么只要剩下两枚硬币有一枚朝上即可,
几率=C(2,1)*(1/3)^1=2/3.

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