回复：你该复习一下概率课程了，都还给老师了，嗬嗬！

来源: 于 2010-11-07 08:54:26 [旧帖] [给我悄悄话] 本文已被阅读：次

Not really.  Just like your answer, It depends on how to use A and B.  If randomly pick A or B, it is 65%, no question about it.  But if not random pick, than my answer is valid.