Hello everyone! Today, we are going to learn about a mathematical concept called: Combination. To understand it, you only need to remember one golden rule: In combinations, order does not matter. Think about it like this. If you have a red ball and a blue ball, it is the same as having a blue ball and a red ball. They are the same pair. Unlike permutations, where the sequence is important, a combination only cares about which items are chosen.