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RU-SPB 2019 Problem 95

  • Grade 9

Call the improvement of a positive number its replacement by a power of two. (i.e. one of the numbers 1,2,4,8,...1, 2, 4, 8, ... ), for which it increases, but not more than than 33 times. Given 21002^{100} positive numbers with a sum of 21002^{100} . Prove that you can erase some of them, and improve each of the other numbers so that the sum the resulting numbers were again 21002^{100} .

Dataset text AI-MO AoPS. Quoted with source.

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