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Find the LCM and HCF of the following integers by applying the prime factorisation method. 12, 15 and 21

Q3 (1)   Find the LCM and HCF of the following integers by applying the prime factorisation method.  12, 15 and 21

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S Sayak

The numbers can be written as the product of their prime factors as follows

12 = 22 x 3

15 = 3 x 5

21 = 3 x 7

HCF = 3 

LCM = 22 x 3 x 5 x 7 = 420

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