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TR-MO-R1 2012 Problem 20

    1,2,3,4,5,6,7,8,9,10,111, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 sayılarının her (a1,a2,…,a11)(a_1, a_2, \dots, a_{11}) permütasyonu için, (a1+a3,a2+a4,a3+a5,…,a8+a10,a9+a11)(a_1+a_3, a_2+a_4, a_3+a_5, \dots, a_8+a_{10}, a_9+a_{11}) verildiğinde aia_i lerden en az kk tanesini belirleyebiliyorsak, kk en çok kaç olabilir?

    a) 11 b) 6 c) 5 d) 2 e) Hiçbiri

    Official text Turkish Mathematical Olympiad, first round 2012 official paper, page 6. Quoted with source.

    A model read this text from the scan of the paper by OCR, with vision/claude@2.1.318 (claude-opus-5-5). No person has checked it against the paper yet.

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