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 ), for which it increases, but not more than than times. Given positive numbers with a sum of . Prove that you can erase some of them, and improve each of the other numbers so that the sum the resulting numbers were again .
Dataset text AI-MO AoPS. Quoted with source.
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