I have some modern algebra homework due tomorrow (and a midterm in there, ) and I've done all of the homework except this problem. I can't for the life of me figure out why a group of order 3 is abelian. I don't see the correlation between a groups order and whether or not a group is communitive.

Do any of you guys have any idea how to show this? Or could you just give me some hints that will get me started?

Thanks.