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Q: Which of the following pairs of numbers are co-prime?
  • A. 28, 81
  • B. 12, 27
  • C. 21, 56
  • D. 36, 20
Correct Answer: Option A - Co-prime numbers are the numbers whose common factor is only 1. Hence, in the given option (28, 81) are co-prime numbers.
A. Co-prime numbers are the numbers whose common factor is only 1. Hence, in the given option (28, 81) are co-prime numbers.

Explanations:

Co-prime numbers are the numbers whose common factor is only 1. Hence, in the given option (28, 81) are co-prime numbers.