NCERT 12 Maths Ex 1.1 Ch 1 Relations & Functions hints and solutions

Questions are solved at following timing:
1 00:01
2 12:56
3 20:00
4 21:28
5 21:50
6 28:46
7 30:14
8 31:36
9 36:25
10 43:18
11 47:44
12 50:10
13 53:50
14 56:28