37/51 is in its simplest form.
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That reduces to 3.
27/3 = 9 and 51/3 = 17 so three is the greatest common factor (it's the only)
3 is the greatest common factor of 21, 27, and 51The GCF is 3.
1, 3, 9, 17, 51, 153 1, 3, 9, 17, 27, 51, 153, 459
1, 17 are the common factors for 17 and 51