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# Sums of Finite Geometric Series

Series with defined ending value has sum: Sn = (a1(1-r^n))/(1-r)
Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Sums of Finite Geometric Series

Calculating the sums of finite geometric series.

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## Finding the Sum of a Finite Geometric Series

This lesson covers finding the sum of a geometric series using the formula and the calculator.

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• Video

## Geometric Series Sum to Figure Out Mortgage Payments

Learn to figure out the formula for fixed mortgage payments using the sum of a geometric series.

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• Practice
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## Finding the Sum of a Finite Geometric Series Quickwrite (PreRead)

To activate prior knowledge, make personal connections, reflect on key concepts, encourage critical thinking, and assess student knowledge on the topic prior to reading using a Quickwrite.

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