It is infinite but the LCM is 1365
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The GCF is: 65
The GCM is infinite.
GCM(18, 42) = 6
The gcm for 9 and 12 would be 3. :)
If GCM stands for Greatest Common Multiple, there is no such number. This is because if x is claimed as the GCM then 2x is a common multiple of both 6 and 8 and 2x > x.