RD Sharma Solutions for Class 10 Chapter 5 “Arithmetic Progressions”- an arithmetic sequence or progression, is a sequence where each term is calculated by adding a fixed amount to the previous term. An arithmetic sequence has a first term, a, and a common difference, d. if terms of an arithmetic sequence are added together an arithmetic series is formed. Chapter 9 contains essential concepts like general, nth, selection, the sum of terms of an A.P.