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2025 VIMC keystage3-IWYMIC individual Question 10

xIMC · 2025 VIMC keystage3-IWYMIC individual

Question 10

Consider a convex $2025$-gon. We draw a subset of its diagonals such that each drawn diagonal (excluding the two endpoints) intersects exactly one of the other drawn diagonals. What is the maximum possible number of such diagonals that can be drawn?