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R. S. Aggarwal’s Arithmetic For Competitive Examinations 21st Edition is a book on basic arithmetic for  candidates aspiring for various competitive examinations across India. The book covers both subjective and objective problems, teaching readers the various concepts in an easy-to-understand method. The book is aimed at readers with a basic understanding of mathematics, and shows simple techniques to solving complex problems. In addition the book contains solutions to problems from various examinations for the students to understand the examination point of view. The book is indispensable for candidates appearing for the SSC, LIC, Railway, UPSC, PCS, Bank PO and RBI exams. About R. S. Aggarwal Dr. R. S. Aggarwal is a retired professor of Mathematics. He has authored more than 75 books on mathematics, some of which are : A Modern Approach To Logical Reasoning, Quantitative Aptitude For Competitive Examinations, A Modern Approach to Verbal Reasoning and Mathematics for MBA Entrance Examinations. Dr. Aggarwal completed his PhD. in Mathematics from the University of Delhi. He enjoys training the future generations in mathematics through his books.