if Ais a subset of B, n(A)=28, n(B)=32 , find n(AUB) , n(AnB)

If A is a subset of B, then A∩B=A and A∪B=B.

Given, n(A)=28 and n(B)=32

∴n(A∩B)=n(A)=28

and n(A∪B)=n(B)=32