Sum

Find the LCM and HCF of the following integers by applying the prime factorisation method

12, 15 and 21

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#### Solution

**12, 15 and 21**

12 = 2 x 2 x 3

15 = 5 x 3

21 = 7 x 3

From the above , HCF(12, 15, 21) = 3 and LCM(12, 15, 21) = 420

Concept: Fundamental Theorem of Arithmetic

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