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A、0.1
B、0.2
C、0.3
D、0.4
【正确答案】:B
【题目解析】:已知P(B)=0.6,即P(非B)=0.4,由P(A|非B)=0.5,得P(AB)=0.3,P(AB)-P(A)*P(B),得P(A)=0.5 , P(A-B)=P(A)-P(AB)=0.2
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