An arithmetic progression (A.P) is a progression in which the difference between two consecutive terms is constant.
Example: 3, 6, 9, 12, 15…. is an arithmetic progression.
Example
Given sequence is 3, 6, 9, 12, 15,…
Here, a = 3 and d = 3
First term is a = 3
Second term is
Third term is and so on.