1. The problem statement, all variables and given/known data I am asked "evaluate the following factorials, permutations, and combinations". I am given a series of questions I understand, like P(10,3), 9!, etc. But then I have a series like this: 2. Relevant equations 3. The attempt at a solution I am not sure what this is, is it a combination, perhaps because there hasn't been any yet, and this is solved by 25C5?