Use the given information to find the indicated probability. P(A ∪ B) = 0.8, P(B) = 0.5, P(A ∩ B) = 0.4.  Find P(A).   If  n(A) = 102, n(A ∪ B) = 147, and n(A ∩ B) = 42, find n(B).

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