oh,是这样.难怪开篇读着很熟悉,甚至公式都一模一样. 因为AoPS的概率他刚学了1/3.所以他有点影响.

来源: Pilsung 于 2024-12-24 11:00:36 [旧帖] [给我悄悄话] 本文已被阅读：次

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