Question

Let A = {1, 2} and let B = {3, 4, 5}. Find A X B.
I am soooo confused about these kinds of problems please help.

Answer 1

A x B is the cartesion product of A and B. That is, the set of all (x,y) where x belongs to A and y belongs to B. Therefore, A x B = { (1,3), (1,4), ... , (2,5) }