Question

The sum of an infinite G.P. with first term unity is (4/5), then the common ratio
A. -1/4
B.1/4
C. 5/4
D. None of these​

Answer 1

Answer:

Here a=1 and sum of infinite term =4/5

a/(1-r) =4/5

1/(1-r) =4/5

1-r = 5/4

r = 1-(5/4)

So, r = -1/4