回复：小学数学题

来源: endofsuburbia 于 2009-03-25 17:17:26 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

Pb=5/6*Pa
Pc=25/36*Pa
Pa+Pb+Pc=1
Pc=25/91

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