rithmetic Progression (AP) is a sequence of numbers in order, in which the difference between

any two consecutive numbers is a constant value. It is also called Arithmetic Sequence

A sequence a₁ , a₂ , a₃ ,…, a_n ,… is called arithmetic sequence or arithmetic progression

if a_n = a+(n-1) d, n ∈ N, where a₁ is called the first term and the constant term d is called the common difference of the A.P.

A.P. (in its standard form) with first term a and common difference d, is given by

 a, a + d, a + 2d, ...