## Sum of first N terms of geometric progression

Geometric progression(sequence) in which the ratio of each term (except the first)to the preceding term is a constant ,the common ratio.if the first term is a and the common ratio is r then the sequence take the form a,ar,ar*r,ar*r*r

## $$\frac{a(1-{r}^{n})}{1-r}$$

where a =first term r=common ratio n=total number of terms

ENTER THE VARIABLES TO BE USED IN THE FORMULA