Question

find the sum of an infinite GP whose first term is 28 and fourth term is 4/49

Answer 1

$\huge\boxed{Solution}$

$<b><i><u>$

let the GP be a,ar,ar²ar³ar^4.....  

Given a =28

ar³ =4/49

So r = 1/7

Now sum of infinite GP is

a/(1-r)=28/(1-1/7)=196/6

Answer 2

\huge\boxed{Solution}Solution​ 

 

let
the GP be a, ar, ar²ar³ar^4.....  

Given:-
a =28

ar³ =4/49

hence

r = 1/7

Now sum of infinite GP is

a/(1-r)=28/(1-1/7)=196/6

Hope it helps you