If P(A)=1/3 and P(B)=3/7 and the P(A n B)=1/8, find the P(A U B).

Answer 1

Same. P(A∪B) = P(A) + P(B) - P(A∩B) = 1/3 + 3/7 - 1/8 = 56/168 + 72/168 - 21/168 = 107/168

Answer 2

P(A∪B) = P(A) + P(B) - P(A∩B) = 1/3 + 3/7 - 1/8 = 56/168 + 72/168 - 21/168 = 107/168