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derangement

v1.0.1

Published

Solve the problem of counting derangements, written as !n

Downloads

3

Vulnerabilities

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Links

Git

Maintainers

azermiteazermite

Keywords

Derangementsfactorialmath

Readme

To know !

Suppose that a professor gave a test to 4 students – A, B, C, and D – and wants to let them grade each other's tests. Of course, no student should grade his or her own test. How many ways could the professor hand the tests back to the students for grading, such that no student received his or her own test back?

Use this library to know the result !

Based on this formula :

Formula

Getting Started

npm i derangement

Importing

let derangementOf = require('derangement')

How to use it ?

Pretty straightforward :

console.log(derangementOf(5))
44

Contributing

To contribute, please submit problems in the Issues tab, or give better implementations with a direct Pull request

License

This project is licensed under the MIT License - see the LICENSE.md file for details