it is 1 and 3
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The factors of 18 = 1, 2, 3, 6, 9, 18 The factors of 30 = 1, 2, 3, 5, 6, 10, 15, 30 Therefore, the common factors (CF) of 18 and 30 are 1, 2, 3, 6 The Greatest Common Factor (GCF) = 6
The common factors of 56 and 18 are 1 and 2.
Prime factors of 18 are 2 and 3 Prime factors of 15 are 3 and 5
Common factors of 9 and 18 are: 1, 3, and 9.