Count to 50 before a staff member

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The calculation was supposed to be a mathematical problem.
The ! means a factorial.
1! = 1
2! = 2*1 = 2
3! = 3*2*1 = 6
4! = 4*3*2*1 = 24
5! = 5*4*3*2*1 = 120

And 0! is just 1 by definition.

Whoops! Now I've forgotten to make a joke!


Or didn't I?
 
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