Question

Find whether the given pair of numbers are co-prime or not a) 9 , 12 b) 15 , 17
c) 21 , 24

Answer 1

Answer:

b is a co-prime pair.

a and c aren't co-prime

Answer 2

9,12 are not co primes since 12 is divisible by 2,3,4,6 hence it is not a prime number.

15,17 are not co primes since 15 is divisible by 1,5,15 so it is not a prime number.

21,24 are also not co primes since 21 is divisible by 1,3,7,21 and 24 is divisible by 1,2,3,4,6,12 and 24.

So none of them are co primes