设A、B 为随机变量,P(A) = a,P(B) = b,P(A + B) =

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问题 设A、B 为随机变量,P(A) = a,P(B) = b,P(A + B) = c,则为:

选项 A. a-bB. c-bC. a(1-b)D. a(1-c)

答案B

解析提示:P(AB)=P(A-B)=P(A)-P(B)-P(AB),[img]/upload/tiku/131/602251_1.jpg[/img]
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