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MathNet 2024-part-02 — 168 problems (EN–VI) Question 77

Math Olympiad Vault · MathNet 2024-part-02 — 168 problems (EN–VI)

Question 77

Let $n$ be a natural number. Joseph can shoot $2n+1$ arrows. Each of his shots is either a miss or a hit. A shot is called "balanced" if the number of misses before this shot plus the number of hits after this shot equals $n$. Determine whether the number of balanced shots is even or odd.