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TR-MO-R1 2021 Problem 23

    f(x)=x2(x−1)(x−3)f(x) = x^2(x-1)(x-3) olmak üzere,

    ∑n=112f(xn)=−4\sum_{n=1}^{12} f(x_n) = -4

    denklemini sağlayan (x1,x2,…,x12)(x_1, x_2, \ldots, x_{12}) tam sayı 12-lilerinin sayısının 11 ile bölümünden kalan kaçtır?

    a) 0 b) 3 c) 6 d) 7 e) 9

    Official text Turkish Mathematical Olympiad, first round 2021 official paper, page 12. 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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