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Since 420 is a multiple of 15, it is automatically the LCM.
The least common multiple (LCM) refers to a multiple that is COMMON to two or more numbers. You have only one number in the question! The least multiple of a number is itself.
The LCM is 420.
LCM 15,84,6= 420 15*28=420 84*5=420 6*70=420
The LCM is: 420
420
LCM(15, 28) = 420
It is: 420