作业帮A weighted coin is flipped three times with P(H)=1/3.What is
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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?
得到0个head的几率是 1*1/3的零次方*2/3的三次方=8/27
得到2个的几率是 3*1/3的二次方*2/3的一次方=2/9=6/27
6/(27-8)=2/7
不懂的话可以追问
再问： 那最後在答题卡上是怎麽写？？
再答： 就这么写啊亲
再问： 我总不能写中文吧～麻烦你拉
再答： 你就直接写几次方就行了啊 我打字更不好打啊
得到2个的几率是 3*1/3的二次方*2/3的一次方=2/9=6/27
6/(27-8)=2/7
不懂的话可以追问
再问： 那最後在答题卡上是怎麽写？？
再答： 就这么写啊亲
再问： 我总不能写中文吧～麻烦你拉
再答： 你就直接写几次方就行了啊 我打字更不好打啊
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