TR-MO-R1 2010 Problem 18
1000 elemanlı bir kümenin 500 elemanlı altkümelerinin sayısı aşağıdaki sayılardan hangisine bölünmez?
a) 3 b) 5 c) 11 d) 13 e) 17
Official text Turkish Mathematical Olympiad, first round 2010 official paper, page 6. Quoted with source.
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