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AMO-Bench 2025 Problem 11

  • Answer

Let x1,x2,…,xnx_{1}, x_{2}, \ldots, x_{n} be positive numbers satisfying x1+x2+⋯+xn=n.x_{1} + x_{2} + \cdots + x_{n} = n. Find the largest positive integer nn such that 1x12+1x22+⋯+1xn2  ≥x12+x22+⋯+xn2.\frac{1}{x_{1}^{2}} + \frac{1}{x_{2}^{2}} + \cdots + \frac{1}{x_{n}^{2}} \;\geq x_{1}^{2} + x_{2}^{2} + \cdots + x_{n}^{2}.

Dataset text AMO-Bench. Open licence.

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