# NCERT Class 10 Mathematics Chapter 5 Arithmetic Progressions

Get unlimited access to the best preparation resource for ICSE/Class-10 Hindi: fully solved questions with step-by-step explanation- practice your way to success.

Download PDF of This Page (Size: 108K) ↧

## Summary

1. An arithmetic progression (AP) is a list of numbers in which each term is obtained by adding a fixed number d to the preceding term, except the first term. The fixed number d is called the common difference.

The general form of an AP is , , , ,..

2. A given list of numbers . . . is an AP, if the differences . . ., give the same value, i.e., if is the same for different values of k.

3. In an AP with first term a and common difference d, the nth term (or the general term) is given by .

4. The sum of the first n terms of an AP is given by:

5. If l is the last term of the finite AP, say the nth term, then the sum of all terms of the AP is given by: