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To get the Least Common Multiple (LCM) of 7920 and 407 we need to factor each value first and then we choose all the factors which appear in any column and multiply them:
|7920: ||2||2||2||2||3||3||5||11|| |
|407: || || || || || || || ||11||37|
The Least Common Multiple (LCM) is: 2 x 2 x 2 x 2 x 3 x 3 x 5 x 11 x 37 = 293040