P(A)=0.8 P(A-B) = 0.2 P(B竖线 A)=0.75 则P( B)=
1个回答
P(A-B) = 0.2
P(A)-P(AandB)=0.2
P(A and B) = 0.6
P(B|A) =P(A and B)/P(B)
0.75=0.6/P(B)
P(B) = 4/5
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