Geometric Progression (GP)

Geometric progression is a sequence of numbers such that each term after the first is obtained by multiplying the previous one by a fixed non-zero number, called the common ratio. For example:

$3, 6, 12, 24, ...$

Here the first term, $a$, is $3$, $a=3$, and the common ratio, $r$, is $2$, $r=2$.

In general,

$a, ar, ar^2, ar^3, ... , ar^{n-1}$ ...