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TR-MO-R1 2020 Problem 15

    P(x)P(x) bir polinom olmak üzere, her aa gerçel sayısı için P(a)=P(b)P(a) = P(b) eşitliğini sağlayan aa dan farklı en az bir bb gerçel sayısı bulunuyorsa, P(x)P(x) polinomuna çok tersli polinom diyelim. P1(x)=x2−2020xP_1(x) = x^2 - 2020x, P2(x)=x3−2020x2+xP_2(x) = x^3 - 2020x^2 + x, P3(x)=x4−2020x2P_3(x) = x^4 - 2020x^2 ve P4(x)=x5−2020x3P_4(x) = x^5 - 2020x^3 polinomlarından kaç tanesi çok terslidir?

    a) 0 b) 1 c) 2 d) 3 e) 4

    Official text Turkish Mathematical Olympiad, first round 2020 official paper, page 8. Quoted with source.

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