Question

If R is a relation from a finite set A having m elements to a finite set B having n elements, then the number of relations from A to B is.

• A. $2 ^ { m n }$
• B. $2 ^ { m n } - 1$
• C. $2 m n$
• D. $m ^ { n }$

Answer 1

Answer: (A)

$2 ^ { m n }$

Answer 2

It is obvious.