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0! = 1

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Visit this site: http://mathforum.org/dr.math/faq/faq.0factorial.html
Author:Math Forum, Ask Dr. Math FAQ
Description: Why does 0! = 1 ?
Levels: Middle School (6-8), High School (9-12)
Languages: English
Resource Types: Frequently Asked Questions (FAQs)
Math Topics: Factorials, Calculus (Single Variable)

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