1,2,3
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The common factors of 6 and 15 is 1 and 3 that's all
The common factors of 6, 21, and 39 are 1 and 3
Since 6 is a factor of 18, all of its factors are common.
Since 6 is a factor of 60, they have in common all of the factors of 6: 1, 2, 3 & 6.
The common factors of 486 and 6 are 1, 2, 3, and 6.