It is: 840
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The LCM is: 168
LCM of 20 and 56 is 280.
the least common multiple of 42,56, and 140 is 840.
The LCM is 56.
92 - 18 = 72 72 - 16 = 56 56 - 14 = 42 42 - 12 = 30 30 - 10 = 20 20 is the next number in the sequence.