oh,是這樣.難怪開篇讀著很熟悉,甚至公式都一模一樣. 因為AoPS的概率他剛學了1/3.所以他有點影響.

來源: Pilsung 於 2024-12-24 11:00:36 [舊帖] [給我悄悄話] 本文已被閱讀：次

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