Question 451783
Given P(A) = .40, P(B) = .50, and P(A ∩ B) = .05, find 
(a) P(A ∪ B) = P(A) + P(B) - P(A and B) = 0.4+0.5-0.05 = 0.85
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(b) P(A | B) = P(A and B)/P(B) = 0.05/0.50 = 0.10
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(c) P(B | A) = P(B and A)/P(A) = 0.05/0.40 = 0.125
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Cheers,
Stan H.