RU-ALLRUSSIAN 2016 Problem 91
A carpet dealer,who has a lot of carpets in the market,is available to exchange a carpet of dimensions either with a carpet with dimensions or with two carpets with dimensions and (the customer can select the number ).The dealer supports that,at the beginning he had a carpet with dimensions greater than and,after some exchanges like the ones we described above,he ended up with a set of carpets,each one having one dimension greater than and one smaller than . Is this possible?
Note:The customer can demand from the dealer to consider a carpet of dimensions as one with dimensions .
Dataset text AoPS wiki problems. Quoted with source.
Solutions
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