What is the difference between permutations and combinations?

Question

What is the difference between permutations and combinations?

In: 25

Answer 1

A permutation is number of different ways you can order a collection of objects. For example, the permutations of ABC are: ABC, ACB, BAC, BCA, CAB, CBA.

Combinations are all the different ways you can select some number of elements from a set, where order doesn’t matter. For example, all of the combinations of size two from the set ABC are: AB, AC, and BC.