1

Introduction

2

Exercise 13.1(1 to 5)

3

Exercise 13.1[6(i,ii)]

4

Exercise 13.1[6(iii),8,9]

5

Exercise 13.1(10,11)

6

Exercise 13.1(12,14,15); Exercise 13.2(1,2)

7

Exercise 13.2(3,5,8,11)

8

Exercise 13.2(10,16)

9

Exercise 13.2(6,7,9,12,15)

10

Exercise 13.3(1,3,4)

11

Exercise 13.3(5,6,7)

12

Exercise 13.3(8,9,10,11)

13

Exercise 13.3(12,13); Exercise 13.4(1,2,3)

14

Exercise 13.4(4,6)

15

Exercise 13.4(9,11,14)

16

Exercise 13.5(1,9,12,13)