Andrea Sanquez thinks this is interesting: In mathematics, the factorial of a non-negative integer number N, denoted as N!, is defined as the product of all positive integers less than or equal to N. For example, the factorial of 5 is calculated as: From How is Python code organized from Learning Python by Fabrizio Romano Publisher: Packt Publishing Released: December 2015 Note Es la suma de todos los enteros positivos mayor o igual a N . Share this highlight http://www.safaribooksonline.com/a/learning-python/2823442/ Twitter Facebook Google Plus Email Get Instant Access Now Start a Free Trial Have an account? Sign in. Minimise Unlock the rest of Learning Python and 30,000 other books and videos By clicking this box, you confirm that you have read and agree to the terms and conditions of our Membership Agreement, and you understand that when your trial period ends, you will be required to provide billing information if you wish to continue using the service. Unlock the rest of this book Start a Free 10-Day Trial loading Learn about Safari for Business Have an account? Sign in.