en.wikipedia.org/wiki/Factorial

As n grows, the factorial n! increases faster than all polynomials and exponential functions (but ...

www.rapidtables.com/math/algebra/Factorial.html

The factorial of n is denoted by n! and calculated by the product of integer numbers from 1 to n.

www.mathsisfun.com/numbers/factorial.html

So the rule is: n! = n × (n−1)!. Which says. "the factorial of any number is that number times the factorial of (that number minus 1)". So 10! = 10 × 9!, ... and 125!

www.purplemath.com/modules/factorial.htm

For instance, "four factorial" is written as "4!" and means 1×2×3×4 = 24. In general , n! ("enn factorial") means the product of all the whole numbers from 1 to n; that ...

www.probabilityformula.org/factorial.html

Factorial of a number n is the product of all positive numbers less than equal to n. For example, for the number 3 the factorial of 3 will be 3×2××1. The factorial of ...

mathworld.wolfram.com/Factorial.html

can be regarded as the additive analog of the factorial n!=n·(n-1)...2·1 . Another relationship between factorials and triangular numbers is given by the identity ...

www.quora.com/What-is-a-factorial-number

Mar 10, 2017 ... Factorial are introduced in algebra. Factorials are products of every whole number from 1 to n. For example, if n is 3 then 3! is 3 x 2 x 1 = 6. It's really just a ...

www.khanacademy.org/computing/computer-science/algorithms/recursive-algorithms/a/the-factorial-function

n−k)!). So the factorial function can be pretty useful. You can learn more about permutations and combinations here, but you don't need to understand them to ...