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Here is a solution that takes 1.5 minutes.


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I have an algorithm to achieve the task with no more than There are some interesting solutions here, most of them do not appear to be complete, however, so I have decided to add mine as well. First, divide the 30 coins into 5 groups of 6 coins each. Label them A, B, C, D, and E. The gist of the algorithm is to find out which of these groups have a fake and ...


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