Easy Permutations and Combinations

I’ve always confused “permutation” and “combination” — which one’s which? Here’s an easy way to remember: permutation sounds complicated, doesn’t it? And it is. With permutations, every little detail matters. Alice, Bob and Charlie is different from Charlie, Bob and Alice (insert your friends’ names here). Combinations on the other hand, are pretty easy going. The details don’t matter. Alice, Bob and Charlie is the same as Charlie, Bob and Alice. Permutations are for lists (order [...]