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The LCM is 20.
180
The LCM is 84.
Since 4 is a multiple of 2, it is automatically the LCM.
20
It is: 60
It is 12
52
5 and 7 share no common factor, so the LCM is 5*7 = 35
12
It is: 12
The LCM of 4, 5, and 8 is 40.
lcm(5, 4) = 20