No, 42 and 108 are not relatively prime. Two even numbers cannot be relatively prime.
No, 54 and 165 are not relatively prime.
Yes, 35 and 54 are relatively prime.
108 is not prime. It is composite. 54 goes into 108 twice. No even number, other than 2 is prime.
It can be. 40 is relatively prime to 41. 40 is not relatively prime to 54.
No, two even numbers cannot be relatively prime.
Yes, they are.
No.
Yes
54 and 99 are not prime numbers because they have more than two factors.
hcf(10, 21) = 1 ⇒ 10 & 21 relatively prime hcf(12, 54) = 6 ⇒ 12 & 54 not relatively prime hcf(15, 27) = 3 ⇒ 15 & 27 not relatively prime hcf(21, 38) = 1 ⇒ 21 & 38 relatively prime
Yes