Given P(A|B) = 1/4 and P(A∩B) = 1/5, what is P(B)?
Correct answer D. 4/5
Explanation
Rearranging the conditional probability formula P(A|B) = P(A∩B)/P(B) gives P(B) = P(A∩B)/P(A|B) = (1/5) ÷ (1/4) = 4/5.
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