Question

find HCF and LCM of 12,21and 15 ​

Answer 1

Answer

Numbers =12,15,21

12=2×2×3

15=3×5

21=3×7

HCF = Product of smallest power of each common prime factor =3′=3

LCM = Product of greatest power of each prime factor 

22×3×5×7=4×3×5×7=420

=3,420

Answer 2

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