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31 is a Prime number meaning it is only divisible by 1 and itself. since 31 is the largest number the only common factor is 1
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Earn +20 ptsQ: What is the greatest common factor of 12 21 and 31?
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The greatest common factor of 21 and 77 is 7.
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-- The greatest factor of 21 is 21 .-- The greatest factor of 12 is 12 .-- 1, 2, and 3 are factors of both 21 and 12 .-- The greatest common ('same for both') factor is 3 .
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