Question: If n(U)=200, n(A) = 100, n(B) = 80, n (ANB)=40, find n (AB)

If n(U)=200, n(A) = 100, n(B) = 80, n (ANB)=40, find n 

If n(U)=200, n(A) = 100, n(B) = 80, n (ANB)=40, find n (AB)

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