Find the sum of first 8 terms of the G.P. 1, 3, 9, 27, 81, .....

Question

KnowledgeBoat · Accepted Answer

Given, a = 1 r = = 3 n = 8 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, S8 = 3280.

Mathematics

Find the sum of first 8 terms of the G.P. 1, 3, 9, 27, 81, …..

G.P.

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The 4th, 6th and last term of a geometric progression are 10, 40 and 640 respectively. If the common ratio is positive, find the first term, common ratio and the number of terms of the series.