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Find the LCM and HCF of 84, 90 and 120 by applying the prime factorisation method.

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Find the LCM and HCF of 84, 90 and 120 by applying the prime factorisation method.

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84 = 22 × 3 × 7, 90 = 2 × 32 × and 120 = 23 × 3 × 5.

HCF = 21 × 31 = 6.

LCM = 23 × 33 × 51 × 71

= 8 × 9 × 5 × 7 = 2520.

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