If n(U)=50,n(A)=20,n(B)=15n(U)=50, n(A)=20, n(B)=15n(U)=50,n(A)=20,n(B)=15 and A,BA, BA,B are disjoint, what is n((A∪B)′)n((A \cup B)')n((A∪B)′)?
15
25
35
50