Any multiple of 126.
126, 252, 378, 504 and so on.
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The LCM of 6, 9, and 42 is 126
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 9, 20, 40, and 42 is 2520.
252
The least common multiple of 42 , 5 , 7 = 210
There are infinitely many of them and so it is not possible to list them. They are numbers of the form 9*k where k is an integer.