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TR-MO-R1 2008 Problem 23

    a,b,c,da, b, c, d gerçel sayıları a2+b2+c2+d2−ab−bc−cd−d+25=0a^2 + b^2 + c^2 + d^2 - ab - bc - cd - d + \dfrac{2}{5} = 0 eşitliğini sağlıyorsa aa kaçtır?

    a) 23\dfrac{2}{3} b)23\dfrac{\sqrt{2}}{3} c)32\dfrac{\sqrt{3}}{2} d) 15\dfrac{1}{5} e) Hiçbiri

    Official text Turkish Mathematical Olympiad, first round 2008 official paper, page 7. Quoted with source.

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