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MathNet 2026 — Part 09 Question 128

Math Olympiad Vault · MathNet 2026 — Part 09

Question 128

Aerith writes $50$ consecutive positive integers in a circle on a whiteboard. Each minute after, she simultaneously replaces each number $x$ with $2020a - x + 2020b$, where $a$ and $b$ were the numbers next to $x$. Can she choose her initial numbers such that she will never write down a negative number?