Factorial & Combinatorics
Calculate factorials, permutations P(n,r), and combinations C(n,r).
10! =
3628800
7 digits
First 20 factorials:
0!
1
1!
1
2!
2
3!
6
4!
24
5!
120
6!
720
7!
5040
8!
40320
9!
362880
10!
3628800
11!
39916800
12!
479001600
13!
6227020800
14!
87178291200
15!
1307674368000
16!
20922789888000
17!
355687428096000
18!
6402373705728000
19!
121645100408832000