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Factors of 15: 1, 3, 5, and 15.
Factors of 6: 1, 2, 3, and 6.
Common factors (numbers on both lists): 1 and 3.
Greatest common factor: 3 .
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The GCF is 3.
The GCF is 15.
The GCF of 9 and 15 is 3. The LCM is 45.