In this article explained about Basic concepts of Sequence and series, introduction and formulas for arithmetic progression like Common Difference, Finite and infinite arithmetic Progressions, nth term , sum to first nth term and Properties of Arithmetic Progression. Also explained problems like finding the nth term , sum to first nth terms, finding the number of terms in given sequence. . . . etc.
Please go through the below links
Arithmetic Progression Formula
Arithmetic Progression Examples
Arithmetic Mean Formula with Practice Questions