# Arithmetic Progressions - NCERT Class 10 Maths

In the introduction part of the chapter 5, the concept of Arithmetic Progressions is explained - patterns in which succeeding terms are obtained by adding a fixed number to the preceding terms. Thus, an arithmetic progression is defined as a list of numbers in which each term is obtained by adding a fixed number to the preceding term except the first term. Further, it is noted that the fixed number is called as Common Difference and it can be positive, negative or zero. Furthermore, the general form of an AP is discussed and infinite and finite forms of AP are explained. Thereafter, for the second exercise of the chapter, the formula for finding the nth term of an AP is derived. Finally, the formula for finding the sum of the first n terms of an AP is derived.