A permutation is an arrangement of objects in a definite order. The members or elements of sets are arranged here in a sequence or linear order. For example, the permutation of set A={1,6} is 2, such as {1,6}, {6,1}. As you can see, there are no other ways to arrange the elements of set A.
<em>A permutation is a mathematical technique that determines the number of possible arrangements in a set when the order of the arrangements matters. ... In other words, the arrangements ab and be in permutations are considered different arrangements, while in combinations, these arrangements are equal.</em>
