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TR-MO-R1 2011 Problem 15

    Aşağıdaki (a,b)(a, b) ikililerinden hangisi için, x+2y<ax + 2y < a ve xy>bxy > b eşitsizliklerini sağlayan hiçbir (x,y)(x, y) pozitif gerçel sayı ikilisi yoktur?

    a) (157,47)\left(\dfrac{15}{7}, \dfrac{4}{7}\right) b) (1811,13)\left(\dfrac{18}{11}, \dfrac{1}{3}\right) c) (57,116)\left(\dfrac{5}{7}, \dfrac{1}{16}\right) d) (67,111)\left(\dfrac{6}{7}, \dfrac{1}{11}\right) e) Hiçbiri

    Official text Turkish Mathematical Olympiad, first round 2011 official paper, page 5. Quoted with source.

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