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Coprime Numbers
publish date: 2026/05/23 05:02:19.447334 UTC
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Which pair of numbers is coprime (relatively prime)?
Correct Answer
8 and 25
Explanation
Two numbers are coprime if their only common factor is 1. The factors of 8 are 1, 2, 4, 8 and the factors of 25 are 1, 5, 25. Their only common factor is 1, so they are coprime. Note that coprime numbers need not themselves be prime.
Reference
Introduction to Differential Calculus (Systematic Studies with Engineering Applications for Beginners) - 2012