Punjab Text Book Board, Lahore, Pakistan. <br />Publication Date = Mar 2010 <br />Edition = 8 <br />Tibbat / Print = 4 <br />Unit 1 <br />Topics covered = 1.6, 1.6.1, 1.6.2 <br /> <br />Due to video length restrictions by Dailymotion, this video is divided into two parts. This is the second one.
