24:05 duration 24 minutes 5 seconds
Sample solving 28
26:17 duration 26 minutes 17 seconds
Sample Solving 25
22:02 duration 22 minutes 2 seconds
Sample Solving 21
13:53 duration 13 minutes 53 seconds
Lecture-28
18:44 duration 18 minutes 44 seconds
Lecture-27
12:19 duration 12 minutes 19 seconds
Lecture-23