设A,B,C是三个随机事件,,P(A)=0.7,P(A-C)=0.4,P(AB)=0.5,则=_______.

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问题 设A,B,C是三个随机事件,,P(A)=0.7,P(A-C)=0.4,P(AB)=0.5,则=_______.

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答案0.2

解析,所以P(A-C)=P(A)-P(C),即
    P(C)=P(A)-P(A-C)=0.7-0.4=0.3,
    =P(AB-C)=P(AB)-P(C)=0.5-0.3=0.2.
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