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Perplex
Perplex
  • Dashboard
Topics
Exponents & LogarithmsRounding & ErrorSequences & SeriesFinancial MathematicsMatricesComplex Numbers
Cartesian plane & linesFunction TheoryModellingTransformations & asymptotes
2D & 3D GeometryVoronoi DiagramsTrig equations & identitiesVectorsGraph Theory
ProbabilityDescriptive StatisticsBivariate StatisticsDistributions & Random VariablesInference & Hypotheses
DifferentiationIntegrationDifferential Equations
Paper 3
Plus
Calculator Skills
Review VideosFormula BookletAll Study Sets
BlogLanding Page
Sign UpLogin
Perplex
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Sequences & Series
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Geometric Series
Sequence Mode (Calculator)
Sequences & Series

Geometric Series

0 of 0 exercises completed

Finite geometric series with sum ​Sn​=1−ru1​(1−rn)​, and infinite geometric series convergence when ​∣r∣<1​ so that ​S∞​=1−ru1​​.

Want a deeper conceptual understanding? Try our interactive lesson! (Plus Only)

Finite Geometric Series
SL Core 1.3

The sum of the first ​n​ terms in a geometric sequence is given by:

​
Sn​=r−1u1​(rn−1)​=1−ru1​(1−rn)​📖
​
Infinite Geometric Series
AHL AI 1.11

If a geometric sequence has a common ratio ​∣r∣<1, then each term will be smaller than the previous term. As the terms get smaller and smaller, the sum of all the terms approaches a finite value:


​
S∞​=1−ru1​​,∣r∣<1📖
​


Nice work completing Geometric Series, here's a quick recap of what we covered:

Skills covered

Mixed Practice

Exercises checked off

I'm Plex, here to help you understand this concept!
/
Sequences & Series
/
Geometric Series
Sequence Mode (Calculator)
Sequences & Series

Geometric Series

0 of 0 exercises completed

Finite geometric series with sum ​Sn​=1−ru1​(1−rn)​, and infinite geometric series convergence when ​∣r∣<1​ so that ​S∞​=1−ru1​​.

Want a deeper conceptual understanding? Try our interactive lesson! (Plus Only)

Finite Geometric Series
SL Core 1.3

The sum of the first ​n​ terms in a geometric sequence is given by:

​
Sn​=r−1u1​(rn−1)​=1−ru1​(1−rn)​📖
​
Infinite Geometric Series
AHL AI 1.11

If a geometric sequence has a common ratio ​∣r∣<1, then each term will be smaller than the previous term. As the terms get smaller and smaller, the sum of all the terms approaches a finite value:


​
S∞​=1−ru1​​,∣r∣<1📖
​


Nice work completing Geometric Series, here's a quick recap of what we covered:

Skills covered

Mixed Practice

Exercises checked off

I'm Plex, here to help you understand this concept!

Generating starter questions...

1 free

Generating starter questions...

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