Can you solve the counterfeit coin riddle? - Jennifer Lu
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To make the problem simpler, for example, we can reduce the total number of coins to 9. To further simplify, we can reveal whether the counterfeit is lighter or heavier at the onset, as is shown here. For a harder version of the problem, start with 39 coins and four weighs.
In all cases, the counterfeit coin riddle offers a fun introduction into the world of deductive reasoning.
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