No, they are not.
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12 and 30 are not relatively prime because they have two common prime factors (2 and 3).
No, they are not relatively prime.
Yes, they are relatively prime.
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, they are relatively prime.