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CIIM 2024 Problem 4

  • Day 2

Dados los puntos O=(0,0)O = (0, 0) y A=(2024,−2024)A = (2024, -2024) en el plano. Para nn entero positivo, Damián dibuja todos los puntos de coordenadas enteras Bi,j=(i,j)B_{i,j} = (i,j) con 0≤i,j≤n0 \leq i,j \leq n y calcula el área de cada triángulo OABi,jOAB_{i,j}. Sea S(n)S(n) la suma de las (n+1)2(n+1)^2 áreas calculadas anteriormente. Hallar el siguiente límite:

lim⁡n→∞S(n)n3.\lim_{n \to \infty} \frac{S(n)}{n^3}.

Official text Iberoamerican Interuniversity Mathematics Competition 2024 official paper, page 1. Quoted with source.

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