The factors of 9 are:
1, 3, 9
The factors of 21 are:
1, 3, 7, 21
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1 and 3 are common factors of 9 and 21
The factors of 9 are: 1, 3, 9The factors of 18 are: 1, 2, 3, 6, 9, 18The factors of 21 are: 1, 3, 7, 21
The factors of 21 are: 1, 3, 7, 21.The factors of 27 are: 1, 3, 9, 27.The common factors are: 1, 3
The factors of 9 are: 1, 3, 9 The factors of 63 are: 1, 3, 7, 9, 21, 63
The factors of 21 are 1, 3, 7, 21. The factors of 63 are 1, 3, 7, 9, 21, 63