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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

Anand Kumar Pandey
askIITians Faculty 5733 Points
2 months ago
Dear Student

12, 15 and 21
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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