The sixth edition of the book 'Discrete Mathematics and Structures' is an outcome of author's continuous discussions with his colleagues and students. Unlike other books, this book helps the readers to develop mathematical maturity and understand the basic concepts of Discrete Mathematics and Structures. Extensive in its coverage, each new concept is gently introduced and then reinforced by a lot of solved examples. Questions from various examinations have been incorporated to enable the students to understand the latest trends in paper-setting.