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### Course: Precalculus > Unit 9

Lesson 2: Geometric series (with summation notation)- Summation notation
- Summation notation intro
- Geometric series with sigma notation
- Worked example: finite geometric series (sigma notation)
- Finite geometric series
- Finite geometric series word problem: social media
- Finite geometric series word problem: mortgage

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# Summation notation intro

## Problem

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