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

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

Grade:12

1 Answers

Harshit Singh
askIITians Faculty 5963 Points
2 years ago
Dear Student

Writing the product of prime factors for all the three numbers,
we get,

12=2×2×3
15=5×3
21=7×3

Therefore,
HCF(12,15,21) = 3
LCM(12,15,21) = 2× 2 × 3 × 5 ×7 = 420

Thanks

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