Question

Geometric progression formula for sum of n natrual numbers

Answer 1

Answer:

Sn = a1(1-r^n)/1-r

Step-by-step explanation:

The general form of a GP is a, ar, ar2, ar3 and so on.

The nth term of a GP series is

Tn = ar^n-1, where a = first term and r = common ratio = Tn/Tn-1) .

The sum of infinite terms of a GP series S∞= a/(1-r) where 0< r<1.

(If a is the first term, r is the common ratio of a finite G.P.)