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TR-MO-R1 2014 Problem 28

    Başlangıçta tahtaya −1, 2, −3, 4, −5, 6-1,\ 2,\ -3,\ 4,\ -5,\ 6 sayıları yazılıdır. Her işlemde tahtaya yazılı olan herhangi aa ve bb sayılarını silip yerine 2a+b2a+b ve 2b+a2b+a sayılarını yazarsak (0,0,0,3,−9,9)(0,0,0,3,-9,9), (0,1,1,3,6,−6)(0,1,1,3,6,-6), (0,0,0,3,−6,9)(0,0,0,3,-6,9), (0,1,1,−3,6,−9)(0,1,1,-3,6,-9), (0,0,2,5,5,6)(0,0,2,5,5,6) altılılarından kaç tanesini elde edebiliriz?

    a) 11 b) 22 c) 33 d) 44 e) 55

    Official text Turkish Mathematical Olympiad, first round 2014 official paper, page 8. Quoted with source.

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