Question 1: My question is how do I know when to use the permutation theorem or comination theorem? Theorem in paint document I'm asking because I would have used permutation thm. on 46 but I was wrong. Problem 46 b. and Problem 47 a. seem similar. The two main differences that I see are 1. 46. We are given a group of ten people to choose from 47. We are given a group of six people to choose from 2. 46. Placement of bride and groom does not matter (Bride and groom must be in picture- No reference to placement) 47. Placement of bride and groom matters (Bride must be next to groom) Therefore do I use combination if Placement matters? And permutation if placement does not matter? Question 2: How would the answer to 46 b change if bride must be next to groom? and how would answer to 47 a change if bride and groom must be in picture?