Q11 of 97 Page 192

Evaluate

Given:

Here, we can see that is in G.P.

Where a = 3, r = 3

We know that Sum of terms in G.P. is given by : (here ‘n’ is the number of terms)

Find the sum to indicated number of terms in each of the geometric progressions in

1, – a, a², – a, ... n terms (if a – 1).

Find the sum to indicated number of terms in each of the geometric progressions in

x³, x^5, x⁷, ... n terms (if x 1).

The sum of first three terms of a G.P. is and their product is 1. Find the common ratio and the terms.

How many terms of G.P. 3, 3², 3³, … are needed to give the sum 120?