JS

PERMUTATIONS COMBINATIONS

(quick guide & examples)

The number of ways we can arrange a list of things.

PERMUTATIONS

01

The order in which it is arranged does matter.

A B C A C B B A C B C A C A B C B A

PERMUTATIONS OF "ABC"

02

A, B, C, AB, BC, etc... are not permutations of "ABC".

Permutation is "number of ways to arrange a list", not "number of variations".

The number of ways we can create from a list of things.

COMBINATIONS

03

The order in which it is arranged does not matter.

A B C A B A C B C A B C

COMBINATIONS OF "ABC"

04

* The order does not matter. So BA=AB, CA=AC, BC=CB, CAB = ACB = BAC, etc...