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You need to check whether they have a common factor. You can simply factor each of the numbers; for numbers that are much larger, using Euclid's algorithm is much faster.If the common factor of two numbers is greater than 1, then they are NOT relatively prime.

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7y ago

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No, THEY are not.

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7y ago
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No, both are divisible by 7.

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7y ago
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Q: Is 21 and 35 relatively prime?
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