TR-MO-R1 2009 Problem 32
Her biri dört elemanlı kümeden, hangi farklı ikisini alırsak alalım, bu iki kümeden yalnızca birine ait olan tüm elemanlardan oluşan küme, başlangıçdaki kümeden birine eşitse, en çok kaçtır?
a) 3 b) 5 c) 7 d) 15 e) Hiçbiri
Official text Turkish Mathematical Olympiad, first round 2009 official paper, page 9. Quoted with source.
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