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TR-MO-R1 2016 Problem 31

    a3+b3+c3−3abc=1a^3 + b^3 + c^3 - 3abc = 1 koşulunu sağlayan a,b,ca, b, c pozitif gerçel sayıları için (a−b)2+(b−c)2+(c−a)2(a-b)^2 + (b-c)^2 + (c-a)^2 ifadesi 2016−2,2016−1,1,20162016^{-2}, 2016^{-1}, 1, 2016 sayılarından kaç tanesine eşit olabilir?

    a) 0 b) 1 c) 2 d) 3 e) 4

    Official text Turkish Mathematical Olympiad, first round 2016 official paper, page 10. Quoted with source.

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