Permutation refers to the act of organising all the representative of a set into some order or rearranging the members. Suppose if the set is already organised, rearranging the elements is termed as permuting. Permutation differs from the combination.
Unlike permutation, the order of selection does not matter in combination. It is a selection of items from a collection. For instance, suppose there are three fruits orange, sweet lime and pineapple. In the above set of fruits, three combinations of two can be formed. That is Orange and sweet lime, orange and pineapple or pineapple and sweet lime.
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Chapter 16 Permutations