Let A, B, and C be sets in a universal set U

Let A, B, and C be sets in a universal set U. We are given n(U) = 73, n(A) = 40, n(B) = 31, n(C) = 32, n(A ∩ B) = 19, n(A ∩ C) = 19, n(B ∩ C) = 17, n(A ∩ B ∩ C) = 9. Find the following values. 

(a) n((A ∪ B ∪ C)^c)

(b) n(A^c ∩ B^c ∩ C)