Question

Let $A,B,C$ are three sets such that $n(A\cap B)=n(B\cap C)=n(C\cap A)=n(A\cap B\cap C)=2$, then $n\left(\right(A\times B)\cap (B\times C\left)\right)$ is equal to

Answer 1

Let us consider the sets as
A = {1 , 2, a, b, c,.....}
B = {1, 2, d, e, f,.......}
C = {1, 2, g, h, i,.......}
common elements are {(1,2),(1,1)(2,1),(2,2)}