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You are blindfolded and sitting at a table with 100 quarters. Ten of the quarters are tails-up and 90 are heads up. You wish to separate the quarters into two piles, each with the same number of tails. You can flip as many as you like and the piles don't need to be the same size. How do you do it?
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Trading Intern

Interviewed at Wolverine Trading

4.7
Feb 21, 2012

You are blindfolded and sitting at a table with 100 quarters. Ten of the quarters are tails-up and 90 are heads up. You wish to separate the quarters into two piles, each with the same number of tails. You can flip as many as you like and the piles don't need to be the same size. How do you do it?

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