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18, 36, 54 and so on. 45, 90, 135 and so on. 63, 126, 189 and so n.
The same as the GCF of 63 and 45 (where 45 is the remainder of the division of 927 by 63).
The factors of 45 are: 1, 3, 5, 9, 15, 45 The factors of 63 are: 1, 3, 7, 9, 21, 63
9
The GCF is 9.