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Help with infinite geometric sums?

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Hey guys! I was absent the day we learned infinite geometric sums and I'm very confused - can anyone post some just basic rules/formulas or just describe how to solve them? 

 

Thank you!

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This link gives you an idea of how to derive the infinite geometric series by yourself: https://www.khanacademy.org/math/precalculus/seq_induction/infinite-geometric-series/v/deriving-geometric-series-sum-formula

 

This is to show you how to calculate the sum of an infinite geometric sequence: https://www.khanacademy.org/math/precalculus/seq_induction/infinite-geometric-series/v/infinite-geometric-series

 

Khan Academy is a very good website for learning new concepts as it explains everything in a very simple way. I recommend you to look at it if you are confused with anything else in the future :)

 

If this doesn't work for you, then google might be a good place to start a new search for simpler explanations :)

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