Pints of beer
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An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians’ wishes? 
Just ONE should suffice. (1/2 + 1/4 + 1/8 + … ~1)
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