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MathNet 2007-part-02 — 187 problems (EN–VI) Question 29

Math Olympiad Vault · MathNet 2007-part-02 — 187 problems (EN–VI)

Question 29

Let $n \gt 1$ be an integer. Find all sequences $a_{1}, a_{2}, \ldots, a_{n^{2}+n}$ satisfying the following conditions:
(a) $a_{i} \in \{0,1\}$ for all $1 \leq i \leq n^{2}+n$;
(b) $a_{i+1}+a_{i+2}+\ldots+a_{i+n} \lt a_{i+n+1}+a_{i+n+2}+\ldots+a_{i+2n}$ for all $0 \leq i \leq n^{2}-n$.