Least Common Multiple (LCM) of 21 and 255

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To get the Least Common Multiple (LCM) of 21 and 255 we need to factor each value first and then we choose all the factors which appear in any column and multiply them:

21:   3 7 
255:   35 17
LCM:   35717

The Least Common Multiple (LCM) is:   3 x 5 x 7 x 17 = 1785

 

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