Although we don't usually consider negative numbers as factors, you could use -9 and -2
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For 126: 2, 3 and 7 For 231: 3, 7 and 11
the factors of 126 are: 1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, and 126, so it has 12 factors
The factors of 126 are 1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, 126
Factors of 126 are 1, 2, 3, 6, 7, 18, 21, 42, 63, 126 Of those factors, 3, 6, 18, 21, 42, 63, 126 are multiples of 3.
The common factors of 126 and 162 are: 1, 2, 3, 6, 9, and 18