👉 Combinatorics is a branch of mathematics that deals with counting problems involving finite sets. It studies ways to choose items from a set, and how many different combinations or permutations are possible. For example, consider choosing 4 students out of 10 at a math competition. This can be thought of as choosing four students from the group of 10 people. In combinatorics, we would count this as 10P4 (which is the number of ways to choose