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Among 100 coins exactly 4 are fake. All genuine coins weigh the same, all fake coins too. A fake coin is lighter than a genuine coin. What is minimal number of weighings on balance scale needed to find at least one genuine coin?
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Programmer

Interviewed at Google

4.4
Sep 7, 2025

Among 100 coins exactly 4 are fake. All genuine coins weigh the same, all fake coins too. A fake coin is lighter than a genuine coin. What is minimal number of weighings on balance scale needed to find at least one genuine coin?

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