TR-MO-R1 2021 Problem 6
Kaç tane pozitif tam sayısı için sayısının rakamları toplamı sayısına eşittir?
a) 1 b) 3 c) 5 d) 7 e) 9
Official text Turkish Mathematical Olympiad, first round 2021 official paper, page 4. Quoted with source.
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