HOSTING A TOTAL OF 318 FORMULAS WITH CALCULATORS

## 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

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

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

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