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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 a⋅ba\cdot b either with a carpet with dimensions 1a⋅1b\frac{1}{a}\cdot \frac{1}{b} or with two carpets with dimensions c⋅bc\cdot b and ac⋅b\frac{a}{c}\cdot b (the customer can select the number cc).The dealer supports that,at the beginning he had a carpet with dimensions greater than 11 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 11 and one smaller than 11. Is this possible?

    Note:The customer can demand from the dealer to consider a carpet of dimensions a⋅ba\cdot b as one with dimensions b⋅ab\cdot a.

    Dataset text AoPS wiki problems. Quoted with source.

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