Question

7.
Find the LCM and HCF of 12, 15 and 21 by applying
prime factorisation method
​

Answer 1

Answer:

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Step-by-step explanation:

$12 = 2×2×3$

$15 =3×5$

$21 = 3×7$

$LCM \: (12,15,21) = 3×2×2×5×7$

$= 420$

$HCF(12,15,21) = 3$

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