The GCF is 1.
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The common factors of 21 42 and 84 are 21
42 prime factors -----> 2,3,7 105 prime factors -----> 3,5,7 There is 3 and 7 in common : There fore 3*7 = 21; 21 is the greatest common factor.
The common factors of 21, 42, and 56 are: 1 and 7
21 itself is the greatest common integral factor, since 21 X 2 = 42.
The common factors of 42 and 273 are 1, 3, 7 and 21.