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Turán's brick factory problem

math Maturity 11-13

A man worked in a brick factory. He saw tracks on the ground. The tracks crossed each other. This made the work hard. He wanted fewer crossings. Can you draw lines without crossing them?

36 words
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File:Zarankiewicz K4 7.svg
Zarankiewicz K4 7.svg
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📚 Content adapted from Wikipedia | Readability: FK 12.1 | Vital Level 5