TR-MO-R1 2011 Problem 12
Bir okuldaki öğrenciden her biri aynı okuldaki istediği öğrenciye mesaj yollamıştır. Karşılıklı olarak mesajlaşmış öğrenci çiftlerinin sayısı en az kaç olabilir?
a) b) c) d) e) Hiçbiri
Official text Turkish Mathematical Olympiad, first round 2011 official paper, page 4. Quoted with source.
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