For example if John Fred and Bill are selected from the team that is considered the same combination as Fred John and Bill. In mathematics a combination is a way of selecting items from a collection where the order of selection does not matter. A combination of numbers and letters equivalent to a sentence in language eg.
The coach knows that there are eight teams but the order the teams play each other does not.
A permutation is an ordered combination. All forms are. A product of real numbers andor variables. A combination is an arrangement of objects where order does not matter.