1.

What is the HCF of 21, 84 and 49 ?1. 12. 73. 214. 3

Answer» Correct Answer - Option 2 : 7

Given:

Numbers = 21, 84 and 49

Concept used: 

If a, b and c are three numbers then their HCF will be the multiplication of the common factors taken from their prime factorization. 

Calculations:

Prime factorization of 21, 84 and 49 can be written as,

21 = 3 × 7

84 = 3 × 4 × 7

49 = 7 × 7

HCF = 7

∴ The HCF of 21, 84 and 49 is 7.



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