Correcting: (2n!)!/(n!n!)types,every type has n!n! permutation

来源: jinjing 于 2010-11-11 18:06:09 [旧帖] [给我悄悄话] 本文已被阅读：次

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Correcting: (2n!)!/(n!*n!)types,every type has n!*n! permutation