1. What is an Arithmetic Progression (AP)?
An Arithmetic Progression is a sequence of numbers in which each term is obtained by adding a fixed number to the preceding term (except the first term).
- The fixed number added is called the common difference ($d$). It can be positive, negative, or zero.
- The standard form of an AP is written as: $a, a+d, a+2d, a+3d, \dots$ (where $a$ is the first term).
2. The $n^{\text{th}}$ Term of an AP ($a_n