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Regional Olympiad - FBH 2018 Grade 9 Problem 4

Source: Regional Olympiad - Federation of Bosnia and Herzegovina 2018

September 18, 2018
analytic geometrygeometrycombinatorics

Problem Statement

Prove that among arbitrary 1313 points in plane with coordinates as integers, such that no three are collinear, we can pick three points as vertices of triangle such that its centroid has coordinates as integers.