The first one says, "give me a pint."
The seconds says, "give me two pints"
The third one says, "give three pints."
Barman says, "Alright! I get it!". He pours 1/12th of a pint back into the barrel.
Then, the barman says, "OK, you guys owe me a dollar each." He then hands the mathematicians 50 cents.
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