👉 Combinations math deals with counting the number of ways to select items from a larger set without regard to the order in which they are chosen. It's fundamental in probability and statistics, where it helps calculate the likelihood of events by determining the number of favorable outcomes divided by the total possible outcomes. For example, if you have a set of n items and you want to choose r items, the number of combinations is given by the formula \( C(n, r) = \frac{n!}{r!(n-r)!} \), where "!" denotes factorial, the product of all positive integers up to that number. This formula accounts for all possible selections of r items from n, ignoring permutations (the order of selection) and focusing solely on the combination itself.
