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TR-MO-R1 2011 Problem 24

    r1,r2,…,rnr_1, r_2, \ldots, r_n renklerinde sırasıyla, a1,a2,…,ana_1, a_2, \ldots, a_n topun bulunduğu bir torbadan, her seferinde çekilen top torbaya geri konmak koşuluyla, birer birer rastgele nn top çekildiğinde bu toplardan en az ikisinin aynı renkte olma olasılığını p(a1,a2,…,an)p(a_1, a_2, \ldots, a_n) ile gösterirsek, aşağıdakilerden hangisi en küçüktür?

    a) p(2,2,2,1)p(2,2,2,1) b) p(1,1,1,1)p(1,1,1,1) c) p(2,2,3)p(2,2,3) d) p(2,2,1)p(2,2,1) e) p(1,1,1)p(1,1,1)

    Official text Turkish Mathematical Olympiad, first round 2011 official paper, page 7. Quoted with source.

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