回复：回复：谢谢解答

来源: jinjing 于 2011-02-09 13:21:49 [旧帖] [给我悄悄话] 本文已被阅读：次

P(A*B)=P(A)+P(B)-P(A+B)=.7+.6-1=.3

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.