最後拿到紅球的概率是N/(M+N) (與順序無關)
那麽1 - N/(M+N) = M/(M+N) 就是紅球先拿完的概率.
最後拿到紅球的概率是N/(M+N) (與順序無關)
那麽1 - N/(M+N) = M/(M+N) 就是紅球先拿完的概率.
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