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27 is not a Prime number and i dont know about 117 but i dont think its a composite #

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The person who gave the above answer has no understanding of "relative primes". Or primes, for that matter.

Neither 8 nor 9 is a prime BUT 8 and 9 are relatively prime (or co-prime) because they have no factor in common. That is what relatively prime means.

117 is not a prime, even if the previous answerer thinks otherwise.

27 and 117 are not relatively prime because both are divisible by 3.

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13y ago

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More answers

Yes, 7 and 20 are relatively prime. The only common factor they have is the number 1, which makes them relatively prime.

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Wiki User

8y ago
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No, they are both divisible by three.

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Wiki User

12y ago
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No, they are not.

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Wiki User

9y ago
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No, they are not relatively prime.

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Wiki User

9y ago
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Q: Are 7 and 21 relatively prime?
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