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TUYMAADA 2022 S6

  • Senior

Kostya marked the points A(0,1),B(1,0),C(0,0)A(0, 1), B(1, 0), C(0, 0) in the coordinate plane. On the legs of the triangle ABC he marked the points with coordinates (12,0),(13,0),⋯ ,(1n+1,0)(\frac{1}{2},0), (\frac{1}{3},0), \cdots, (\frac{1}{n+1},0) and (0,12),(0,13),⋯ ,(0,1n+1).(0,\frac{1}{2}), (0,\frac{1}{3}), \cdots, (0,\frac{1}{n+1}). Then Kostya joined each pair of marked points with a segment. Sasha drew a 1×n1 \times n rectangle and joined with a segment each pair of integer points on its border. As a result both the triangle and the rectangle are divided into polygons by the segments drawn. Who has the greater number of polygons: Sasha or Kostya? (M. Alekseyev )

Dataset text AI-MO AoPS. Quoted with source.

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