Today`s Daily Brain Teaser:

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Posted: 07 Jul 2011 03:46 AM PDT In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin? Solution

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