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MathNet 2025-part-01 — 187 problems (EN–VI) Question 142

Math Olympiad Vault · MathNet 2025-part-01 — 187 problems (EN–VI)

Question 142

Find all natural numbers $n$ such that $(n + 1)!(n + 2)! = (2n)!$. Here $m! = 1 \cdot 2 \cdot \dots \cdot m$.