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Shortlisted Problems with Solutions
www.imo-official.orgShortlisted problems 3 Problems Algebra A1. Let nbe a positive integer and let a 1,...,an´1 be arbitrary real numbers. Define the sequences u 0,...,un and v 0,...,vn inductively by u 0 “ u 1 “ v 0 “ v 1 “ 1, and uk`1 “ uk `akuk´1, vk`1 “ vk `an´kvk´1 for k“ 1,...,n´1. Prove that un “ vn. (France) A2. Prove that in any set of 2000 distinct real numbers there exist two ...