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Factorial is calculated by taking the number and multiplying it continually by 1 less than that until you finally multiple by 1.

For example 6! = 6x5x4x3x2x1 = 720

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Q: How do you calculate factorial without calculator?
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#!/usr/bin/perl print factorial($ARGV[11]); sub factorial { my($num) = @_; if($num == 1) { return 1; # stop at 1, factorial doesn't multiply times zero } else { return $num * factorial($num - 1); # call factorial function recursively } }