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次称重足以在 
个硬币中找到一个坏硬币（Steinhaus 1999, p. 61）。vos Savant (1993) 给出了一个算法，用三次称重在 12 个球中找到一个坏球（此外，还确定坏球是比其他 11 个球重还是轻），Steinhaus (1999, pp. 58-61) 给出了一个 13 个球的算法。
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