Mark the correct alternative in the following:
If A and B are two disjoint sets, then n is equal to
Here, A and B are two disjoint sets.
⇒A⋂B=ϕ
⇒n(A⋂B)=0
n(A⋃B)=n(A)+n(B)-n(A⋂B)
=n(A)+n(B)-0
=n(A)+n(B)