如果是随机选择为白的条件下，结果是1/2没错。随机为白的概率是2/3，第三球的无条件黑的概率1/3，相除，1/2

来源: QualityWithoutName 于 2024-02-21 11:42:15 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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