Result
n!
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About Factorial
The factorial of a non-negative integer n, denoted as n!, is the product of all positive integers less than or equal to n.
For example:
- 5! = 5 × 4 × 3 × 2 × 1 = 120
- 3! = 3 × 2 × 1 = 6
- 0! = 1 (by definition)
Factorials are used in:
- Permutations and combinations
- Probability theory
- Taylor series expansions
- Many other areas of mathematics
Note: Factorials grow very quickly. For example, 20! has 19 digits. Our calculator can handle values up to 1000!