Question

If n (A)=3, n(B)=5 and A is subset of B.Then, n (A intersection B)=?

Answer 1

Answer: The number of element in (A intersection B) is 3.

Step-by-step explanation:

A is a subset of B ( given)

=> any element, 'a' in A belongs to B.

It means 'a' is common element in A and B.

So,

'a' will also be in (A intersection B)

=> n(A intersection B)= n(A)

Therefore,

n(A intersection B)= 3 (because n(A)=3)