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TR-MO 2011 Problem 1

    n≥2n \geq 2 ve E={1,2,…,n}E = \{1, 2, \dots, n\} olsun. A1,A2,…,AkA_1, A_2, \dots, A_k; EE nin altkümeleri olmak üzere, her 1≤i<j≤k1 \leq i < j \leq k için, Ai∩AjA_i \cap A_j, Ai′∩AjA_i' \cap A_j, Ai∩Aj′A_i \cap A_j' ve Ai′∩Aj′A_i' \cap A_j' kümelerinden tam olarak bir tanesi boş ise, kk nin alabileceği en büyük değeri belirleyiniz.

    [ AA, EE nin bir altkümesi ise, EE nin AA ya ait olmayan elemanlarının kümesini A′A' ile gösteriyoruz. ]

    Official text Turkish Mathematical Olympiad 2011 official paper, page 1. Quoted with source.

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