Question

if A and B are two sets such that : n(A intersection B ) =12 and n (A union B) =5 , then find n(A x B)

Answer 1

Answer:

n(A×B)= n(A intersection B)+n(AUB)=12+5=7

Answer 2

If n(A intersection B) =12

Then how n(Aunion B) =5