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MathNet 2018-part-04 — 181 problems (EN–VI) Question 11

Math Olympiad Vault · MathNet 2018-part-04 — 181 problems (EN–VI)

Question 11

How many pairs of positive integers $(a, b)$ are there, both not exceeding $10$, such that $a \leq \operatorname{gcd}(a, b) \leq b$ and $a \leq \operatorname{lcm}(a, b) \leq b$?