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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.
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## Sums of Finite Geometric Series

by CK-12 //at grade

Calculating the sums of finite geometric series.

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## Finding the Sum of a Finite Geometric Series

by CK-12 //at grade

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

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• PLIX

## Sums of Geometric Series

by CK-12 //at grade

Sums of Finite Geometric Series Interactive

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• Video

## Geometric Series Sum to Figure Out Mortgage Payments

by CK-12 //at grade

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

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• 0