The greatest common multiple is infinite.
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GCM(18, 42) = 6
The answer is 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.
(11/18) - (1/6) = (11/18) - (3/18) = (11-3)/18 = 8/18 = 4/9
11/18 - 1/6 = 11/18 - 3/18 = 8/18 = 4/9