Answer:

1. Permutations are for lists (order matters) and combinations are for groups (order doesn't matter). You know, a "combination lock" should really be called a "permutation lock

2.There are also two types of combinations (remember the order does not matter now): Repetition is Allowed: such as coins in your pocket (5,5,5,10,10) No Repetition: such as lottery numbers (2,14,15,27,30,33)