TR-MO-R1 2015 Problem 14
2015 den büyük olmayan pozitif tam sayılardan oluşan kümesinde herhangi iki elemanın farkı bu iki elemanın toplamını tam bölmüyorsa, en fazla kaç olabilir?
a) 403 b) 462 c) 504 d) 613 e) 672
Official text Turkish Mathematical Olympiad, first round 2015 official paper, page 5. Quoted with source.
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