TR-MO 2017 Problem 5
Azalmayan bir pozitif tam sayı dizisinde ve altdizisi tam olarak 25 farklı pozitif tam sayı içeriyor.
olduğunu gösteriniz. Eşitliği sağlayan dizilerin sayısını bulunuz.
Official text Turkish Mathematical Olympiad 2017 official paper, page 2. Quoted with source.
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