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MathNet 2025 — Part 01 (100 complete bilingual questions) Question 34

Math Olympiad Vault · MathNet 2025 — Part 01 (100 complete bilingual questions)

Question 34

Show that there are infinitely many triples $(a, b, c)$ of positive integers such that

$$a^{2} + b^{2} + c^{2} + (a + b + c)^{2} = abc.$$