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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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Q: What is the LCM of 21 and 72?
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