Sum of a geometric series up to infinity

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SUMMARY

The discussion focuses on solving a geometric series problem with a first term of 54 and a fourth term of 2. The common ratio is determined to be 1/3. The participants seek assistance in calculating the sum to infinity of the series and identifying how many terms are needed for the sum to exceed 99% of this total. The nth term formula is suggested as a starting point for further calculations.

PREREQUISITES
  • Understanding of geometric series and their properties
  • Familiarity with the formula for the nth term of a geometric series
  • Knowledge of the formula for the sum to infinity of a geometric series
  • Basic algebra skills for solving equations
NEXT STEPS
  • Learn the formula for the sum to infinity of a geometric series
  • Study how to derive the nth term of a geometric series
  • Research methods for determining the number of terms needed to approach a specific percentage of the sum to infinity
  • Practice solving similar geometric series problems for mastery
USEFUL FOR

Students studying mathematics, particularly those focusing on sequences and series, as well as educators looking for examples of geometric series applications.

Alekz
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Homework Statement


A geometric series had first term 54 and 4th term 2.
(i) What is the common ratio?
(ii) Find the sum to infinity of the series.
(iii) After how many terms is the sum of the series greater than 99% of the sum to infinity?


Homework Equations


N/A


The Attempt at a Solution


(i) Is obviously 1/3 (54,18,6,2...)
I've no idea how to attempt ii or iii, if someone could explain this I'd be grateful
 
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Welcome to PF!

Hi Alekz! Welcome to PF! :smile:

Start by writing the nth term as a function of n :wink:
 

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