Hi - I have homework like: Question Let A and B be finite sets of cardinalities m and n, respectively. You may assume m and n are positive integers but you may not assume any ordering of m and n. 1. How many relations are there from the set A to set B? comments I'm to arrive at a solution to this question logically, you know, show all the logic, but I'm not sure where to begin. I took a logic course about a year and a half ago and I admit I'm a bit rusty on it. I purchased Velleman's How to Prove It and have been working through it in order to get up to speed; should I keep studying this book or look somewhere else?