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Rajan@2021
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Asked: 2021-05-24T06:15:57+05:30 In:

Using prime factorisation, find the HCF and LCM of 12, 15 and 21

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One of the most important and conceptual question from real numbers chapter in which we have given three numbers 12, 15 and 21 and we have been asked to find the HCF and LCM of the given numbers by using the method of prime factorization

RS Aggarwal, Class 10, chapter 1B, question no 2(ii)

class 10 cbsereal numbersrs aggarwal
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      prime factors 12,15,21

      12=2×2×3=2²×3
      15=3×5
      21=3×7

      HCF(12,15,21)=3
      LCM(12,15,21)= 2²×3×5×7=420

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