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Anonymous
Prime factors of 21 are: 3 and 7
Prime factors of 40 are: 23 and 5
LCM = 23*3*5*7 = 840
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840
The LCM is 21.
The LCM of 4, 5, and 8 is 40.
The LCM is 40.
LCM for 5 and 40 is 40.