Question

The hcf and the lcm of 12, 21,15 respectively are.

Answer 1

Step-by-step explanation:

1)12

HCF=1,2,3,4,6,12

LCM=2×2×3

2)21

HCF=1,3,7,21

LCM=3×7

3)15

HCF=1,3,5,15

LCM=3×5

Answer 2

Step-by-step explanation:

12=2x2x3

15=5x3

21=7x3

As, 3 is the common prime factor of 12, 25 and 21,

∵ HCF(12,15,21)= 3

As, LCM= product of the prime factors

             =2x2x3x5x7

             =420

∵LCM(12,15,21)= 420