## Arithmetic Progression

A sequence is a set of numbers arranged in a definite pattern. Each number is called a term.

A finite sequence is one that has a last term when listed. For Example: 2,4,6,8,,…,16. An infinite sequence is one that does not have a last term when listed.

Arithmetic Progression follows the rule of linear sequence which is the sequence in which each term is obtained by adding a distant number (Positive or Negative) to the proceeding terms.

The constant number is called **common difference** and it is denoted as “d” while the **first term** is denoted as “a”.

If T_{1}, T_{2}, T_{3}, T_{4}, T_{5}, … is a linear sequence, the common difference is obtained as: