Question 855770
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Hi,
P(A)=0.5, P(B)=0.6 and P(B|A)=0.9   |Assume You mean conditional Probability
P(B|A) = P(B&#8745;A)/P(A)= .9  &#8658; P(B&#8745;A) = {{{.9*.5 = .45}}}
P(A 0R B) = P(A) + P(B) - P(B&#8745;A)  = .5 + .6 - .9 = .2
P(A) = .5