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Question

If P(not A)=0.7,P(B)=0.7 and P(B/A)=0.5, findP(AB).

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Solution

P(BA)=P(AB)P(A)

0.5=P(AB)0.3\\ P(AB)=0.15

P(AB)=P(AB)P(B)=0.150.7=0.214

P(AB)=0.3+0.70.15=0.85

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