TR-MO-R1 2013 Problem 10
den küçük ve ile aralarında asal olan tam olarak 20 tane pozitif tek tam sayı bulunmasını sağlayan kaç pozitif tam sayısı vardır?
a) 5 b) 4 c) 3 d) 2 e) Hiçbiri
Official text Turkish Mathematical Olympiad, first round 2013 official paper, page 4. Quoted with source.
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