Question

Find the L.C.M and H.C.F of the following integers by applying the prime factorisation method (i) 12,15and21

Answer 1

Here,

12 = 2×2×3

15 = 3×5

21 = 3×7

Therefore,

HCF = 3

and, LCM = 2×2×3×5×7

= 20×21

= 420.

Answer 2

#####Hope it helps you.