Mark the correct alternative in the following: If A and B are two disjoint sets, then n is equal to

Question

Philoid · Accepted Answer

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)