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Factorial

Tool for computing factorials. Factorial n! is the product of all integers numbers (not zero) inferior or equal to n, it is symbolized by an exclamation point juxtaposed after the number.

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Factorial -

Tag(s) : Arithmetics

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# Factorial

## Answers to Questions (FAQ)

### How to calculate a factorial?

Factorial of a number $n$ is calculated with a multiplication: it is the product of the positive integers numbers (not null) less or equal to $n$.

The usual notation to indicate a factorial is the exclamation mark positioned after the number. The factorial of $n$ is noted $n!$.

$$n!=\prod_{k=1}^n k = 1 \times 2 \times 3 \times \cdots \times n$$

Example: $$4! = 1 \times 2 \times 3 \times 4 = 24$$

## Source code

dCode retains ownership of the online 'Factorial' tool source code. Except explicit open source licence (indicated CC / Creative Commons / free), any 'Factorial' algorithm, applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any 'Factorial' function (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and no data download, script, copy-paste, or API access for 'Factorial' will be for free, same for offline use on PC, tablet, iPhone or Android ! dCode is free and online.

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## Questions / Comments

Thanks to your feedback and relevant comments, dCode has developed the best 'Factorial' tool, so feel free to write! Thank you!

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