BdMO 2012 secondery Q9

Discussion on Bangladesh Mathematical Olympiad (BdMO) National
Munir Zaman
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Joined:Mon Nov 09, 2020 9:47 pm
BdMO 2012 secondery Q9

Unread post by Munir Zaman » Sat Dec 05, 2020 10:06 pm

Consider a n×n grid of points. Prove that no matter how we choose 2n-1 points from these, there will
always be a right triangle with vertices among these 2n-1 points.

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