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TR-MO-R1 2011 Problem 4

    {1,2,…,20}\{1,2,\dots,20\} kümesinin 8 elemanlı altkümelerinden kaçı ardışık sayılar içermez?

    a) (138)\dbinom{13}{8} b) (139)\dbinom{13}{9} c) (148)\dbinom{14}{8} d) (149)\dbinom{14}{9} e) (2015)\dbinom{20}{15}

    Official text Turkish Mathematical Olympiad, first round 2011 official paper, page 2. Quoted with source.

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