If we look at combination meaning: it is a way of selecting specific items from a given collection. In combination, the order of the selection does not matter. The combination can also refer to a combination of specific items from a group at a time without repetition. Here is a simple example to explain the combination: we have three digits (4,5,6), and we want to make a three-digit number from the given numbers; there are various possibilities of the combination, which are 456, 564, 654, 546, 645, and so on. Combination basically provides information about an easy way to work out how many ways 4, 5, and 6 can be placed in an order.