試求主持人隨機選取第一次空盒，放回重選第二次又得空盒，求二盒中一盒為空的概率。

來源: t130152 於 2024-02-21 05:57:14 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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