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  • Perplex
    IB Math AIHL
    /
    Sequences & Series
    /

    Geometric Series

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    Geometric Series

    Definition and general term of geometric series, finite and infinite series, convergence

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

    Exercises

    No exercises available for this concept.

    Key Skills

    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📖


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