192.
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GCM(18, 42) = 6
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.
The answer is 6
6 and 7 are two whole integers that come to mind.
The greatest common multiple is infinite.