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Question

Find the LCM and HCF of 12, 15 and 21 by applying the prime factorization method. [2 MARKS]

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Solution

Prime factorisation : 1 Mark
H.C.F : 0.5 Mark
L.C.M : 0.5 Mark

212263

12 = 2×2×3

3155

15 = 3×5

3217

21 = 3×7

So H.C.F = 3

L.C.M = 420


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