(2n!)!/(n!n!)shoud be (2n)!/(n!n!)

來源: jinjing 於 2010-11-12 08:47:07 [舊帖] [給我悄悄話] 本文已被閱讀：次

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(2n!)!/(n!*n!)shoud be (2n)!/(n!*n!)