The Least Common Multiple (LCM) for 11 3 7 is 231.
The LCM is: 231
77
44
55
The LCM is 550.
It is: 1925
It is: 220
88...
LCM(12, 11, 5) = 660
It is 198 which is also the LCM
21 is the LCM of 3 and 7
the lcm of 3 and 7 is 21 and the lcm of 7 and 21 is 21, so the lcm of 3, 7 and 21 is the lcm of 21 and 21 which is 21.