There cannot be any such thing as a "greatest common multiple". Once you find the least common multiple of a set of numbers, you can keep adding the LCM to itself over and over again. Each new number you get will be a common multiple of your set of numbers, but each new number will always be larger than the previous. This means that you can keep adding while the number approaches infinity and you will still never find a greatestmultiple.
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The Least Common Multiple (LCM) of 21, 42, and 49 is 294.
The greatest common factor of 147 and 196 is 49.
The Least Common Multiple of 21, 63, 147: 441
The least common multiple of the numbers 147 and 20 is 2,940.
The greatest common factor of 70 147 175 and 280 is 7.