No. 6 is not a factor of 15. The greatest common factor of 15 and 18 is 3.
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The LCM of these numbers is 18. LCM is Least Common Multiple. The GCF of these numbers is 6. GCF is Greatest Common Factor.
18 and 6.
You need at least two numbers to find a GCF. The GCF of 18 and 24 is 6.
3 and 18
3