Relative prime-ness requires a set of two or more numbers to share the same positive integer factors and no others. Since the number 54 adds the factors 9, 18, and 27, to the factors of 12, the two numbers are not relatively prime.
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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, 35 and 54 are relatively prime.
No, they are not relatively prime.
54 and 99 are not prime numbers because they have more than two factors.
Yes