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Find the HCF and LCM of $84, 90$ and $120$ by prime factorization method.
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$84 = 2^2 \times 3\times7$
$90 = 2 \times 3^2 \times 5$
$120 = 2^3 \times 3\times5$
HCF = $6$
LCM = $2520$
$90 = 2 \times 3^2 \times 5$
$120 = 2^3 \times 3\times5$
HCF = $6$
LCM = $2520$