Question

Find the hcf and lcm of 12 15 and 21 by using prime

Answer 1

Answer:

HCF= 3

LCM= 420

Step-by-step explanation:

firstly emwe do the prime factorisation of12, 15,21, so,

12 =2*2*3

15 =3*5

21 =3*7

so the HCF is 3 because product of the smallest power of each common prime factor in the numbers is HCF

and LCM is 2*2*3*5*7 =420 because product of the greatest power of each prime factor involved in the numbers