👉 In mathematics, a combination is an operation that combines two or more elements to form a new element. For example, in the set of all integers, 1+2=3, and the set of all positive odd numbers, 1, 3 are both combinations of the set of all positive odd numbers. Combinations can be used to count how many different ways you can select items from a larger group of items. For example, in a deck of cards, there are 52
