0.105= 4C(13,4)C(13,3)C(13,3)C(13,3)/C(52,13)

来源: oops_yz 于 2018-12-13 18:00:52 [旧帖] [给我悄悄话] 本文已被阅读：次

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0.105= 4*C(13,4)*C(13,3)*C(13,3)*C(13,3)/C(52,13)