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Omni-MATH / Vova has a square grid 72×72. Unfortunately, n cells are stained with coffee. Determine if Vova always can cut out a clean square 3×3 without its central cell, if a) n=699; b) … · Discussion

Discussing Vova has a square grid 72×72. Unfortunately, n cells are stained with coffee. Determine if Vova always can cut out a clean square 3×3 without its central cell, if a) n=699; b) … · Omni-MATH

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