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Q: Find out which of the following sets form co-prime numbers.
  • A. (12, 7)
  • B. (21, 42)
  • C. (3, 9)
  • D. (43, 129)
Correct Answer: Option A - Co-prime numbers- The set of two such numbers whose HCF is 1, is called co-prime numbers. In option (a), HCF of the numbers (12, 7) = 1
A. Co-prime numbers- The set of two such numbers whose HCF is 1, is called co-prime numbers. In option (a), HCF of the numbers (12, 7) = 1

Explanations:

Co-prime numbers- The set of two such numbers whose HCF is 1, is called co-prime numbers. In option (a), HCF of the numbers (12, 7) = 1