Q. 125.0( 1 Vote )

Mark the correct A. 1

B. 3

C. 8

D. none of these

Answer :

Let say GP is


a,ar,ar2


where a is the first term and r is the common ratio


Also, given that r = 2


So, GP becomes


a,2a,4a


nth term = ar(n-1) = 128


a.2(n-1) = 128



a.2n = 256


Sum of n terms of GP





Substituting a2n in above equation we get


-255 = a-256


a =1.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :

The product of thRD Sharma - Mathematics

Express <imRS Aggarwal - Mathematics

If a, b, c are inRS Aggarwal - Mathematics

Express <imRS Aggarwal - Mathematics

Prove that RS Aggarwal - Mathematics

If a, b, c are inRS Aggarwal - Mathematics

The sum of n termRS Aggarwal - Mathematics

If a, b, c, d areRS Aggarwal - Mathematics

Evaluate :
</p
RS Aggarwal - Mathematics

The first term ofRS Aggarwal - Mathematics