KöMaL 2023 K751
We have five chocolate trufles, all of them look alike. However, three of them weigh 20 g each, one weighs 19 g, and one weighs 21 g. We want to identify the 19-g trufle with the help of an equal-arm balance only. Prove that it is possible to do it by using the balance three times, but less than three is not enough.
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