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The factors of the two numbers are :-

51 : 1, 3, 17 and 51

21 : 1, 3, 7 and 21.

Ignoring the trivial factor of 1, the only common factor and therefore the greatest common factor is 3.

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15y ago

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The greatest common factor of 21 and 651 is 21.

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14y ago
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Q: What is the greatest common factor of 21 and 651?
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