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There is no "greatest common multiple" for any pair of numbers. If you meant greatest common factor, the answer is 3.
The LCM is 60. There is no GCM since it would go to infinite.
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.
The Least Common Multiple of 12, 15: 60
The greatest common multiple of 7 and 15, like any two numbers, is infinite.The lowest common multiple, the smallest number into which both 7 and 15 divide, is 105The greatest common factor, the largest number which divides both 7 and 15, is 1.