Find the sum of first 9 terms of the G.P. 1,-1/2,1/4,-1/8

Question

KnowledgeBoat · Accepted Answer

Given, a = 1 r = n = 9 We know that, The sum of the first n terms of a G.P. is given by: [For r 1] Substituting values we get : Hence, S9 = .

Mathematics