Manuals/calci/FACTORIAL

FACTORIAL (Number)

• $Number$ is any positive integer.

Description

• This function is showing the result of factorial of a number.
• Factorial means the result of multiplying a sequence of descending natural numbers down to 1.
• In $FACTORIAL(Number)$,$Number$ is any positive integer.
• So the factorial $n!$ is defined for a positive integer n as:

$n!=n*(n-1)*...2*1$.

• For example 4!=4*3*2*1 = 24.
• The given number will truncated to integer if the given number is in Decimal.
• This function will returns the result as NaN when the given number is in negative.

Examples

1. FACTORIAL(9) = 362880
2. FACTORIAL(4.3) = 24
3. FACTORIAL(54) = 2.308436973392414e+71
4. FACTORIAL(-3) = NaN

See Also

• FACTDOUBLE
• FACTUNTIL
• List of Main Z Functions
• Z3 home

References

• Factorial