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WealthEffect Contests 
Weekly Challenge |
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You are given 12 coins and a scale. One of these coins is false, but you don't know if it's heavier or lighter than the rest — and the scale, like the scales of justice, can only compare the weight on one side versus the other (it won't tell you exact weights). What is the minimum number of weighings necessary to always find the false coin? Describe. |
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