Module 6
Combinatorics
Compute permutations, combinations, factorials, and stars-and-bars with full step-by-step solutions and a quick-reference factorial table.
Parameters
P(n,r) — ordered arrangements of r items from n (no repetition)
Factorial Reference
0! through 12!
0!1
1!1
2!2
3!6
4!24
5!120
6!720
7!5,040
8!40,320
9!362,880
10!3,628,800
11!39,916,800
12!479,001,600