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For Geeks & Brainiacs #11- Orbiting Coin -

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You have two identical coins. If you place one above the other, as in the image below, how many times will the top coin rotate completely (360°) as it orbits around the coin below it before returning to its original position?

Puzzle Image
Do you have a suggestion for this puzzle (e.g. something that should be mentioned/clarified in the question or solution, bug, typo, etc.)?