The prime factors are:
12 = 2 * 2 *3
21 = 3 *7
30 = 2 * 3 * 5
So the greatest common factor is 3.
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The greatest common factor in 3
The Greatest Common Factor of 14 and 21 is 7.
21 itself is the greatest common integral factor, since 21 X 2 = 42.
The greatest common factor of 18 and 21 is 3.
The Greatest Common Factor (GCF) is: 7