Find the sum to the indicated number of terms in the geometric progression: $1, -a, a^{2}, -a^{3}, \ldots$ to $n$ terms (if $a \neq -1$).
- A$\frac{1-(-a)^{n}}{1+a}$
- B$\frac{1+(-a)^{n}}{1+a}$
- C$\frac{1-(-a)^{n}}{1-a}$
- D$\frac{1+(-a)^{n}}{1-a}$
Explore More
Similar Questions
If $p, q, r$ are in one geometric progression and $a, b, c$ are in another geometric progression,then $cp, bq, ar$ are in
Easy
View SolutionThree numbers are in $G.P.$ such that their sum is $38$ and their product is $1728$. The greatest number among them is
Easy
View SolutionIf the roots of the equation $x^3-7x^2+14x-8=0$ are in geometric progression,then the difference between the largest and the smallest roots is
Divide $155$ into three parts such that the three numbers are in a Geometric Progression $(GP)$ and the first term is $120$ less than the third term.
Difficult
View SolutionThree numbers are selected from the set $\{3^1, 3^2, 3^3, \dots, 3^{20}\}$. Find the number of ways the selected numbers can form an increasing $G.P.$
Vedclass Products
For Students
Vedclass Test Series
Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.
Start Free TrialFor Teachers
Exam Paper Generator
Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.
Try FreeFor Institutes
Online Exam Module
Live online exams with unlimited students, 360° analytics & white-label branding.
See Demo