The purpose of this book is to create interest in mathematics and not to teach mathematics as such. The book is meant for students, teachers and members of the public at large who want to know what mathematics is all about. Mathematics which was once termed as the Queen of Sciences used to attract some of the most talented students to its study. The charm of mathematics has, however, diminished for a number of reasons, the prime reason being that we, as as teachers, have failed to project mathematics as an interesting and appealing subject. If only the students of mathematics could understand the applications of what they are taught in classes to real-life situations their appreciation of