I just joined up to help with math I need for a hobby (programming) as well as learning ways to help my son with his algebra(I'm comfortable at that level yet having trouble getting the most basic ideas through due to his learning difficulties.)

It's been 10 plus years since I had any math homework (last class was a second semester of Calculus which I barely passed.)

My main interest right now hobby wise are permutations or combinatronics; I don't know which or what.