哈哈哈，原來你是數學教授啊。難怪那道排列組合題你能夠想到一般人想不到的方法。。。。：）

來源: 塵凡無憂於 2021-10-04 06:17:04 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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