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For Geeks & Brainiacs #02- Counterfeit Coin -

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Puzzle Image You are handed 12 identical looking coins (numbered 1 through 12) and a balance scale and are told that one of the coins is counterfeit. Luckily, the balance scale can reveal the counterfeit coin because its weight is slightly different than the weight of the other coins.

Your challenge is to identify which of the 12 coins is counterfeit with only 3 weighings.
Do you have a suggestion for this puzzle (e.g. something that should be mentioned/clarified in the question or solution, bug, typo, etc.)?