Question

Which of the following  number pairs are  co-prime​

Answer 1

my dear, complete the question first.

where are the options!?

Answer 2

Answer:

Two numbers or integers are co-prime if their common factor is only 1

I think question is incomplete

If u r question is this

Which of the following pairs of numbers is co – prime ?

A.(17,15)

B.(10,16)

C.(20,24)

D.(31,64) then

Answer is

17 and 35 have prime factors 1 , 17 and 1 , 5 , 7 respectively . Thus there is no other common factor other than 1 .

Therefore they are co – primes .

(10,16) , (20,24) , (31,64) each have common primes factors other than 1 thus these are not co – primes.

Note-

In these questions remember to only look for prime factors while finding factors of each number . The concept of co – primes must be properly understood to solve such types of questions

Hope it will help u