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Omni-MATH / Does the set 1,2,3,...,3000 contain a subset A consisting of 2000 numbers that x∈A implies 2x notin A ?!! :?: · Discussion

Discussing Does the set {1,2,3,...,3000} contain a subset A consisting of 2000 numbers that x∈A implies 2x notin A ?!! :?: · Omni-MATH

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