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Q: Are 4 and 21 relatively prime?

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Yes, they are relatively prime.

It can be. 21 is relatively prime with 32.

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No, 14 and 21 are not relatively prime. They share the factor 7.No.

It can be. 36 is relatively prime to 25. 36 is not relatively prime to 21.

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No, they are not.

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13 and 4 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, 4 and 15 are relatively prime.

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Two numbers are considered relatively prime if their GCF is 1. 4 and 9 are relatively prime.

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