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1, 3 and 9 are common factors of 27, 45 and 81. 27, 45 and 81 are multiples of 1, 3 and 9.
The first 3 multiples of 4 are: 4, 8, and 12.The first 3 multiples of 9 are: 9, 18, and 27.
9, 18, 27.
3, 9, and 15. 6 and 18 are also multiples of 3, but are even.
The multiples of 81 are infinite. The factors of 81 are: 1, 3, 9, 27, 81.