Question

The common ratio of a GP is -4/5 and the sum to infinity is 80/9, then calculate the first term.

Answer 1

Answer:

16

Step-by-step explanation:

Given,

Sn=80/9, r=-4/5 and a=?

use, Sn = a/(1-r)

80/9 = a/(1+4/5) = a/(9/5) = 5a/9

5a = 80

a = 80/5 = 16.