Let  U = {1, 2, 3, 4, 5, 6, 7, 8, a, b, c, d, e}.  If  A = {1, 2, a, e}  and  B = {1, 2, 3, 4, a, b, c},  find the following. (a)     n(Ac) (b)     n(A ∩ Bc) (c)     n(A ∪ Bc) (d)     n(Ac ∩ Bc)

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