# If A and B are finite sets such that

Question:

If A and B are finite sets such that A ⊂ B, then n(A ∪ B) = ____________.

Solution:

Let n(A) = m

n(B) = n, since both are finite set

Since Athen AB

⇒ n(AB) = n(B)

n(AB) = n(B)