KA-0094
about 135sOne of nine identical-looking coins is slightly heavier. Using only a balance, what is the smallest number of weighings that is certain to find it?
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Needs an idea, not just a procedure.
3 in a row to finish this ladder.
0/1 solvedOne of nine identical-looking coins is slightly heavier. Using only a balance, what is the smallest number of weighings that is certain to find it?