mathjs/docs/reference/functions/factorial.md

Function factorial

Compute the factorial of a value

Factorial only supports an integer value as argument. For matrices, the function is evaluated element wise.

Syntax

math.factorial(n)

Parameters

Parameter	Type	Description
n	Number | BigNumber | Array | Matrix	An integer number

Returns

Type	Description
Number | BigNumber | Array | Matrix	The factorial of n

Examples

var math = mathjs();

math.factorial(5);    // returns 120
math.factorial(3);    // returns 6

See also

combinations, permutations