How to do Factorials on the Sharp EL-531XT Calculator

A quick tutorial on how to solve factorials (!) on a Sharp EL-531 XT Scientific calculator.

Contents:
0:00 Outro
0:20 Buttons used
0:34 What is a Factorial (!)
0:51 Factorial Example (5!)
1:37 Factorial Example (3!)
1:53 Factorial Example (20!)
2:09 Outro

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After using casio fx-cg50 and fx-991EX for years, being told I can only use this primitive stone tool for my 3 years of university, I wouldnt wish it on my worst enemy