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MathNet 2011 Question 46

Math Olympiad Vault · MathNet 2011

Question 46

Let $a_1, \dots, a_{14}$ be distinct positive integers. All 196 numbers of the form $a_i + a_j$ ($1 \le i, j \le 14$) are written on a blackboard. May it happen that for each two digits $a, b$ there exists a written number with a decimal representation ending by $\overline{ab}$?