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A puzzle where you have to optimize a certain objective function (maximize profit, minimize cost). There should ideally be a provable best answer, to avoid making the puzzle into an [open-ended] game.

7 votes

30 fake coins out of 99 coins

I found a way to guarantee finding a fake coin after the following number of weighings: EDIT: Explanation modified again to also allow fractional weight of a real coin. The algorithm itself remains t …
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