Thread: Find the Coin puzzle
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Old 06-21-2010, 01:04 PM   #8
HarryT
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Yes, the key is that:

Spoiler:
the showman lifting a cylinder he knows is empty doesn't alter your initial 1/3 chance of being right, so you're left with 2/3 for the other cylinder, whereas revealing whether or not a cylinder is empty at random does change it.
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