Question

if the common ratio of geometric progression is 2/3 and sum of infinity is 12. find first term?​

Answer 1

Answer:

We have common ratio, r = 2/3

& sum of infinity, S = 12

We know sum of infinite G.P. , S = a / 1 - r

=> 12 = a / 1 - 2/3

=> 12 = 3a

=> a = 4 ( which is first term of G.P. )