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What is gcd(84, 126)? | QuestionStock

Representative image for question: What is gcd(84, 126)?

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Mathematics

What is gcd(84, 126)?

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What is gcd(84, 126)?

Options:

12
14
21
42

Correct answer: 42

Explanation: Prime-factor 84 = 2^2·3·7 and 126 = 2·3^2·7, so the greatest common divisor multiplies common primes 2·3·7 = 42.

Created 2026-03-10T18:16:32.505Z. Updated 2026-03-10T18:16:32.505Z.