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Co-prime numbers are two numbers that have only 1 as a common factor. Which pair is co-prime?

Class 6Prime and Composite NumbersPlaying with Numbers
  • A8 and 12
  • B9 and 16
  • C10 and 15
  • D14 and 21

Step-by-Step Solution

and share no common factor except 1, so they are co-prime. The other pairs share a common factor (4, 5, 7).
Answer: B) 9 and 16

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