P(A) =0.4, P(B) =0.2 ,则p(B|A)=

"> P(A) =0.4, P(B) =0.2 ,则p(B|A)=

">

设A,B为随机事件,且 P(A) =0.4, P(B) =0.2 ,则p(B|A)=

设A,B为随机事件,且 P(A) =0.4, P(B) =0.2 ,则p(B|A)=


A、0.2
B、0.4
C、0.5
D、1
【正确答案】:C
【题目解析】:

因为所以AB=B,


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