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MathNet 2025 — Part 01 (100 complete bilingual questions) Question 32

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

Question 32

The positive integers $a \lt b \lt c$ are such that $a + b + 2c$ is a common multiple of $b$ and $c$ (*).

a) Prove that the greatest common divisor of $a + b$ and $c$ is $c$.

b) Find the positive integers $k \lt 1000$, so that $abc = k^2$ and $a, b, c$ fulfill (*).