-3.7, -2.1, -1.8, -1.7
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2,870,795,128,037,760 or approx 2.871*1015
The greatest common factor of 18 and 21 is 3.
The Least Common Multiple (LCM) for 2 6 18 21 is 126.
The Least Common Multiple of 10, 18, 21 is 630.