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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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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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