Comments on: Good Puzzles Are the Reason I Check Facebook
https://blog.tanyakhovanova.com/2024/10/good-puzzles-are-the-reason-i-check-facebook/
Mathematics, applications of mathematics to life in general, and my life as a mathematician.Sat, 02 Nov 2024 13:41:22 +0000
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By: Zarunias
https://blog.tanyakhovanova.com/2024/10/good-puzzles-are-the-reason-i-check-facebook/#comment-14016
Sat, 02 Nov 2024 13:41:22 +0000https://blog.tanyakhovanova.com/?p=2098#comment-14016You can group the paths into pairs: Every path is paired with the path you get if you rotate the whole path by 180°. In this way every path that passes through more black cells is paired with a path that passes through more white cells and vice versa. As there is no middle cell in the grid no path is paired with itself. So the numbers must be the same.
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