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P(B) = P(A U B) - P(A) = 2/3 - 1/2 = 4/6 - 3/6 = 1/6
b. P(A l B) = P (A n B) / P(B) = P (A) . P(B) / P(B) = P(A) = 1/2
c. P (B l A) = P (A n B) / P(A) = P (A) . P(B) / P(A) = P(B) = 1/6