Mathematics is a science of logical thinking and art of solving problems. This tutorial has been revised thoroughly, keeping in mind exclusively the requirements of students.While revising this tutorial, great care has been taken to explain mathematical concepts clearly and to provide adequate number of examples. The endeavour has been directed towards giving an optimum amount of knowledge followed by problems which are compatible with that knowledge. Special stress has been laid on the simplicity of the language in the tutorial. A lot of effort has been made to present the subject matter in clear, concise and understandable form for the benefit of students.