jksnakajsja jksnakajsja

14-04-2020
Mathematics

contestada

Evaluate the sum of the following finite geometric series.
5+15+45 +135+ . . . + 1215
Sn=1

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mobilegamingexpert mobilegamingexpert

14-04-2020

Answer:

1820

Step-by-step explanation:

The sum of the first n terms of a geometric series with common ratio r and first term a is:

a(1-r^n)/(1-r). Plugging this in 5(1-3^6)/(1-3)=1820

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