Question

find the hcf and lcm of 84,90 and 120 by prime factorisation method

Answer 1

Hi Friend !!!

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84 = 2×2×3×7

90 = 3×3×5×2

120 = 2×2×2×3×5

HCF , Highest Common Factor = 2×3 = 6

LCM , Least Common Multiple = 7×2×5×3×5×2×2 = 2³×5²×3×7 = 4,200


♡♥hope it helps u♥♡

Answer 2

HELLO........FRIEND!!

THE ANSWER IS HERE,

Given that numbers=> 84 ; 90 & 120

=> 84 =2×2×3×7

=> 90=3×3×5×2

=> 120=2×2×2×3×5

HCF => 3×2 => 6.

LCM => 2×2×2×5×5×3×7


$= > \: {2}^{3} \times {5}^{2} \times 3 \times 7$

$= > \: 4200$


:-)Hope it helps u.