Question

If B⊆ A then n(A∩B) is​

Answer 1

Answer:

A set A is a subset of set B, denoted, A ⊆ B, if every element x of A is also an element of B. ... Then, R ⊆ S e.g., R is subset of S. so, we can say that n(B) = n(A ∩ B)