This edition has been designed to enhance students' knowledge of quantitative aptitude and equip them with the skills that will enable them to succeed in any competitive examination. It presents concepts in a lucid and unambiguous manner. Each chapter contains definitions and explanations of fundamental principles on all major sections of QA, which are further augmented with illustrative examples to enable students to learn and recall faster. It also includes completely worked-out solutions to a large range of problems along with fully solved previous years' questions from various competitive examinations.