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The 5-Way Scale

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arxiv 1903.04900 v1 pith:YROABJ5Z submitted 2019-03-08 math.CO math.HO

classification math.COmath.HO
keywords scalecoinsdiscusslessmuchstrategyweighingsbetter
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abstract

In this paper, we discuss coin-weighing problems that use a 5-way scale which has five different possible outcomes: MUCH LESS, LESS, EQUAL, MORE, and MUCH MORE. The 5-way scale provides more information than the regular 3-way scale. We study the problem of finding two fake coins from a pile of identically looking coins in a minimal number of weighings using a 5-way scale. We discuss similarities and differences between the 5-way and 3-way scale. We introduce a strategy for a 5-way scale that can find both counterfeit coins among $2^k$ coins in $k+1$ weighings, which is better than any strategy for a 3-way scale.

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