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Earn +20 ptsQ: Is 7 and 21 relatively prime?
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Are 21 and 39 relatively prime?
21 = 3 x 7 39 = 3 x 13 So 21 and 39 are not relatively prime as they are sharing a common factor: 3
Are 21 and 44 relatively prime?
Yes, they are relatively prime.
Is 4 and 21 relatively prime?
Yes, they are relatively prime.
Are 16 and 21 relatively prime?
Yes, they are relatively prime.
I need to know which pair of numbers in relatively prime 10 and 21 or 12 and 54 or 15 and 27 or 21 and 38?
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
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