9 Coins

Given `9` coins that look identical. One of the coins is counterfeit, and its weight is less than the weight of a regular coin. How to find the counterfeit coin using two weighings on a balance scale without weights?

Difficulty level (1 very easy - 10 very hard): 2

Topics:
Logic -> Reasoning / Logic Algorithm Theory -> Weighing Minimum and Maximum Problems / Optimization Problems
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