Multiple choice

Which of the following numbers is not co-prime with 14?

  1. 11

  2. 13

  3. 15

  4. 7

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

HCF of 11 and 14 is 1, hence 11 is co-prime with 14. HCF of 13 and 14 is 1, hence 13 is co-prime with 14. HCF of 15 and 14 is 1, hence 15 is co-prime with 14. HCF of 7 and 14 is 7, hence 7 is not co-prime with 14.  

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