最后拿到红球的概率是N/(M+N) (与顺序无关)
那么1 - N/(M+N) = M/(M+N) 就是红球先拿完的概率.
最后拿到红球的概率是N/(M+N) (与顺序无关)
那么1 - N/(M+N) = M/(M+N) 就是红球先拿完的概率.
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