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Anonymous
The factors of 21 are 3x7 The prime factors of 72 are 2x2x2x3x3 So you need to multiply 2x2x2x3x3x7 2x2x2x3x3x7=504 Therefore the LCM of 21 and 72 is 504
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The LCM is 72.
The LCM is 72.72
Least Common Multiple (LCM) for 6 72 is 72.
The LCM is 1080.