Answer :
105 = 105/5
21/3
7/7
1
84 = 84/2
42/2
21/3
7/7
1
3 and 7 is common in both so 3*7 tat equal to 21
HCF = 21
21/3
7/7
1
84 = 84/2
42/2
21/3
7/7
1
3 and 7 is common in both so 3*7 tat equal to 21
HCF = 21