第二題答案是不是:C(16+3,3)+C(15+3,3)+...+C(1+3,3)+C(0+3,3)

來源: 皆兄弟也於 2010-09-08 09:10:55 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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