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The LCM is 168.
LCM(2, 8, 21) = 168
LCM for 2 and 21 is 42.
The LCM is: 168
LCM of 3, 8 and 21 is 84...
The LCM is 8.
LCM of 2 and 8 = 8
The LCM is: 296,184
168
The LCM is: 88