TR-MO-R1 2018 Problem 4
Her elemanı sayısının bir pozitif böleni olan ve herhangi iki farklı elemanının çarpımı tam küp olmayan bir kümede en çok kaç eleman bulunabilir?
a) 65 b) 70 c) 73 d) 77 e) 80
Official text Turkish Mathematical Olympiad, first round 2018 official paper, page 3. Quoted with source.
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