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TR-MO-R1 2009 Problem 26

    Her 0≤i≤170 \le i \le 17 için, aia_i sayısı, −1-1, 00 veya 11 olmak üzere,

    a0+2a1+22a2+⋯+217a17=210a_0 + 2a_1 + 2^2a_2 + \cdots + 2^{17}a_{17} = 2^{10}

    eşitliğini sağlayan kaç (a0,a1,…,a17)(a_0, a_1, \ldots, a_{17}) on sekizlisi vardır?

    a) 9 b) 8 c) 7 d) 4 e) 1

    Official text Turkish Mathematical Olympiad, first round 2009 official paper, page 8. 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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