This question does not make sense as asked.
The least common multiple of 10 15 and 25 is 150.
The greatest common multiple is 150 x n where n is any number you like. No matter how big you make n, there is always a bigger one. Since there can't be a greatest n, there can't be a greatest common multiple.
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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.
There is no "greatest common multiple" for any pair of numbers. If you meant greatest common factor, the answer is 3.
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.
3