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120 is an elite, nerdy way of saying "LOL!" See 5. LOL means "Laughing out loud" and is a common acronym used in chatting everywhere. LOL (or lol), written in 1337 is 101. 101 in binary is equal to 5 in decimal. The factorial of five (5!) is 120. So, the factorial of LOL (5) is 120. LOL! = 120
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