Question

if A and B are two sets having 3 elements in common . if n(A) =5,n(B)=4, find n(A*B) and n[(A*B) intersection (B*A)] ​

Answer 1

3 common so A∩B =3 so B∩A is same.

n(AB∩BA)

i am confused...

hope u get

Answer 2

I am not sure if we can answer the second part like this but the first one is correct.