There can be no greatest common multiple.
If x were the greatest common multiple, then 2x would be a still greater common multiple. So x could not be the greatest. Thus there is no such thing as a greatest common multiple.
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The Greatest Common Factor of 15, 35, 54: 1
7 and 35
The Least Common Multiple (LCM) of 12, 35, and 15 is 420.
5
The GCF is 1.