This cannot be answered because the common multiples of any two or more numbers are infinite.
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Since the list of numbers is infinite, there is no such thing as the Greatest Common Multiple.
The lowest common multiple, or lowest common denominator, of 18 and 28 is 252.
The Least Common Multiple (LCM) of 18 and 28 is 252.
The least common multiple of the numbers 18 and 28 is 252.
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