This book has been designed to meet the syllabus requirements of the students of B.Sc.(H)(Math/Computer Sc./Physical Sc.), B.C.A/M.C.A., B.Tech. (C.S.E., E.C.E., I.T.,), M.Tech.(C.S.E./I.T.), M.Sc. (Mathematics/C.S./Electronics) and other professional courses of various Universities/ Institutions at home and abroad. The students of Open and Distance Education courses will find the book most useful.