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Revision as of 14:43, 6 July 2021
The ! symbol is used to represent the factorial operation.
When a factorial appears inside a sentence, it's possible to misinterpret the ! as an exclamation mark:
"How many ways of ordering six objects are there?"
"There are 6!"
Two ! symbols together represent the double factorial, multiplying just the odd or even numbers. So juxtaposition doesn't represent composition here: \(x!! \neq (x!)!\)
