As factors, 1 and 3.
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The Least Common Multiple (LCM) for 12 2 9 is 36.
1, 2, 3, 4, 6, 8, 12, 16, 24, 48 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
The Least Common Multiple (LCM) for 12 9 64 is 576.
3, 4, and 7 are the common factors of 9 12 and 21.
The GCF of 4, 9, and 12 is 1.