Question

. If sum of an infinite geometric series is
and its 1st
3
term is
then its common ratio is
​

Answer 1

Step-by-step explanation:

Given

1−r

a

=4 and ar=

4

3

.

Eliminating a we have

16r

2

−16r+3=0

(4r−3)(4r−1)=0

∴r=3/4,1/4. Hence r=1/4 so that a=3, r=3/4 is not given in any of the four choices so we choose only r=1/4.

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