Combinatorics
Factorial Equations
Find n where n! = X
- High school
- about 4 min
- 4 of 11 in the family
Not started
Factorial table (click to select)
0!
1
1!
1
2!
2
3!
6
4!
24
5!
120
6!
720
7!
5040
8!
40320
9!
3.6e+5
10!
3.6e+6
n = 5
5! = 120 ✓
Find n where n! = ?
Factorial equation: n! = X. Solve by computing factorials and finding a match. Solution exists only for X = 0!, 1!, 2!, ...