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Anonymous
The LCM is 84.
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LCM(7, 12, 21) = 84
3=3*1 7=7*1 21=3*7 LCM=(3*7)=(21*1)=21
LCM(21, 7) = 21
252 12 * 21 = 252 9 * 28 = 252 7 * 36 = 252
The LCM is: 21LCM of 3 & 7 is 21.