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TR-MO-R1 2018 Problem 25

    Bir A1A2…A26A_1A_2\dots A_{26} düzgün 26-geninde A1A9,A1A15,A1A16A_1A_9, A_1A_{15}, A_1A_{16} doğruları A8A21A_8A_{21} doğrusunu sırasıyla B,C,DB, C, D noktalarında kesiyorlar. ∣A8B∣∣CD∣\dfrac{|A_8B|}{|CD|} kaçtır?

    a) 11 b) 2\sqrt{2} c) 3\sqrt{3} d) 22 e) 33

    Official text Turkish Mathematical Olympiad, first round 2018 official paper, page 9. Quoted with source.

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