The greatest common multiple of any set of integers is infinite.
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The LCM or least common multiple of 3 and 5 is 15.The GCF or greatest common factor of 3 and 5 is 1.
There is no greatest common multiples for whatever common multiple is claimed to be the greatest the lowest common multiple of the numbers (in this case 15) can be added to get an even greater common multiple.
The GCF of 12 and 15 is 3, and the LCM is 60.
1 and 3 are the only numbers that have common multiples of 15 and 18.
35 x 3 = 105 = 15 x 7