如果是隨機選擇為白的條件下，結果是1/2沒錯。隨機為白的概率是2/3，第三球的無條件黑的概率1/3，相除，1/2

來源: QualityWithoutName 於 2024-02-21 11:42:15 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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