Media Summary: A line is "sunny" if it avoids three simple directions. How many sunny lines can you use to cover a triangular grid of points?
A line is "sunny" if it avoids three simple directions. How many sunny lines can you use to cover a triangular grid of points?
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![An IMO Divisibility Problem [IMO 1964 Problem 1]](https://i.ytimg.com/vi/_3XIyr6Z3dY/mqdefault.jpg)
Today we
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A line is "sunny" if it avoids three simple directions. How many sunny lines can you use to cover a triangular grid of points?
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![[Very first IMO problem in history] 1959 IMO Problem #1](https://i.ytimg.com/vi/2tkrdmq8U9k/mqdefault.jpg)
We present three different
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