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TR-MO-R1 2019 Problem 26

    nn bir pozitif tam sayı ve a1,a2,…,an∈{−3,2}a_1, a_2, \dots, a_n \in \{-3, 2\} olmak üzere, ∑k=1nak(nk)=87\displaystyle\sum_{k=1}^{n} a_k \binom{n}{k} = 87 eşitliği sağlanıyorsa, nn nin alabileceği en küçük değer nedir?

    a) 66 b) 77 c) 88 d) 99 e) 1010

    Official text Turkish Mathematical Olympiad, first round 2019 official paper, page 14. Quoted with source.

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