Question

Find HCF and LCM
of
:
1-21, 28, 36 45​

Answer 1

Answer:-

21 = 3 × 7.

28 = 2 × 2 × 7 = 22 × 7.

36 = 2 × 2 × 3 × 3 = 22 × 32

45 = 5 × 3 × 3 = 5 × 32

HCF = product of smallest power of each common prime factor in the numbers = 1.

LCM = product of greatest power of each prime factor involved in the numbers = 22 × 32 × 5 × 7 = 1260.