SolutionThe correct option is A 2mn
The total number of relations that can be formed between two sets is the number of subsets of their Cartesian product.
Here, n(A) = m and n(B) =n
⇒ n(AXB)= mn
Hence, Number of relations between A and B = 2mn
NOTE: If n(A) = m, then the number of subsets of set A = 2m