Question

(d) 2
5. The HCF and the LCM of 12, 21, 15 respectively are
2
11​

Answer 1

Answer:

first do LCM for all three no's.

12=2^2×3

15=3×5

21=3×7

LCM=2^2×3×5×7

=420

HCF=3 cause the 3 is the smallest power of each common prime factor factor