1. There are 17 candidates for an elected office. If 10 candidates are selected to participate in a debate, determine the total number of possible debate groups.
2. Race Winners Theoretically, assuming no ties, how many possibilities are there for first, second, and third places in a marathon race with 150 entries?
3. Player Introductions The five starting players of a basketball team are introduced one at a time. In how many different ways can they be introduced?