TR-MO-R1 2009 Problem 28
Tüm tam sayılar kümesi, farkları asal bir sayıya eşit olan herhangi iki tam sayı aynı altkümeye düşmeyecek biçimde, altkümeye ayırılabiliyorsa, en az kaçtır?
a) 6 b) 5 c) 4 d) 3 e) Hiçbiri
Official text Turkish Mathematical Olympiad, first round 2009 official paper, page 8. Quoted with source.
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