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TR-MO-R1 2019 Problem 28

    Bir ağaç üzerinde bulunan 2222 yuvanın herhangi ikisi r1,r2,…,rnr_1, r_2, \dots, r_n renklerinden biri ile boyalı bir iple birleştirilmiştir. Bir salyangoz, her k=1,2,…,nk = 1, 2, \dots, n için herhangi bir yuvadan herhangi başka bir yuvaya sadece rkr_k rengine boyalı ipler üzerinde ilerleyerek varabiliyorsa, nn nin alabileceği en büyük değer nedir?

    a) 2121 b) 2020 c) 1616 d) 1212 e) 1111

    Official text Turkish Mathematical Olympiad, first round 2019 official paper, page 14. Quoted with source.

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