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n(A) = 17
n(B) = 19
n(A∪B)' = 4
n(s) = n(A) + n(B) + n(AUB)' - n(A∩B)
n(A∩B) =n(A∪B)' + n(A)+ n(B) - n(s)
n(A∩B) = 4+17+19 - 32
n(A∩B) = 8
P(A∩B) = n(A∩B) / n(S)= 8/32 = 1/4