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The highest common multiple of any set of integers is infinite.
The least common multiple (LCM) is often also called the lowest common multiple or smallest common multiple. Keep in mind that these different terms all refer to the same thing: the smallest positive integer which is a multiple of two or more numbers.The least common multiple of 18 and 19 is 342.
Both values are prime, thus we conclude that the GCF (and the only common factor) is 1.
The Least Common Multiple (LCM) for 15 19 is 285.
The least common multiple of 19 , 6 , 12 = 228