Question

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

Answer 1

Answer:

HCF=6

LCm=2520

Explanation:

First of all we will find the prime factors of 84,90 and 120

84=2*2*3*7=$2^{2}$*3*7

90=2*3*3*5=2* $3^{2}$*5

120=2*2*2*3*5=$2^{3}$*3*5

⇒HCF(84,90,120)= 2*3=6

⇒LCM(84,90,120)=$2^{3}$*$3^{2}$*7*5=2520