Define

1: Combination: A combination refers to the selection of items from a larger set where the order of the items does not matter. In mathematics, it is denoted as "nCr" or "C(n,r)", where "n" represents the total number of items and "r" represents the number of items selected.

2: Permutation: A permutation is an arrangement of items from a larger set where the order of the items does matter. In mathematics, it is denoted as "nPr" or "P(n,r)", where "n" represents the total number of items and "r" represents the number of items selected.

3: Binomial: Binomial refers to a mathematical concept or event that involves exactly two outcomes, usually labelled as "success" and "failure". In statistics and probability theory, the binomial distribution is a discrete probability distribution that represents the number of successes in a fixed number of independent Bernoulli trials, where each trial has the same probability of success.