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What is the sum of the series?

2+4+8+16+...+512

 Mar 6, 2018
 #1
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N =[Log(L/F) / Log(R)] + 1, where N=Number of terms, L=Last term, F=First term, R=Common Ratio.

N =[Log(512/2) / Log(2)] + 1

N = 9 - this is the number of terms. Then sum it up as Geometric Series:

First term =2

Common Ratio = 2

Number of terms =9

You should get S = 1,022

 Mar 6, 2018
edited by Guest  Mar 6, 2018

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