Let A and B be subsets of a universal set U and suppose n(U) = 350, n(A) = 130, n(B) = 70, and n(A ?… Show more Let A and B be subsets of a universal set U and suppose n(U) = 350, n(A) = 130, n(B) = 70, and n(A ? B) = 50. Find the number of elements in the set: n(Ac ? Bc) • Show less