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TR-MO-R1 2022 Problem 19

    nn bir pozitif tam sayı olmak üzere, x12+x22+⋯+xn2=87x_1^2 + x_2^2 + \cdots + x_n^2 = 87 ve x1+2x2+⋯+nxn=51x_1 + 2x_2 + \cdots + nx_n = 51 eşitliklerini sağlayan x1,x2,…,xnx_1, x_2, \ldots, x_n gerçel sayıları bulunuyorsa, nn en az kaç olabilir?

    a) 2 b) 3 c) 4 d) 5 e) 6

    Official text Turkish Mathematical Olympiad, first round 2022 official paper, page 11. Quoted with source.

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