问题描述：
一道概率题 but 表示读不懂...
suppose that A1,A2,A3,and B are event where A1,A2,and A3 are mutually exclusive and p(A1)=0.2,p(A2)=0.5,p(A3)=0.3,P(B|A1)=0.02,P(B|A2)=0.05,P(B|A3)=0.04,求p(b)
suppose that A1,A2,A3,and B are event where A1,A2,and A3 are mutually exclusive and p(A1)=0.2,p(A2)=0.5,p(A3)=0.3,P(B|A1)=0.02,P(B|A2)=0.05,P(B|A3)=0.04,求p(b)
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