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Summing Infinite Geometric Sequences | Year 2 Pure | A Level Maths

An infinite geometric series can be summed exactly when the common ratio satisfies |r| < 1, and the result is a beautiful and useful formula. In this lesson you will learn how to use the convergence condition |r| < 1, apply the formula S-infinity = a / (1 — r), and use the modulus notation correctly. The lesson covers worked examples with positive and negative ratios and shows the connection to recurring decimals and modelling.

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Lesson Video On Summing Infinite Geometric Sequences

Follow the lesson video carefully with a pen and paper. By the end of it you should be comfortable with this topic. If you want a blank copy of this lesson to follow along, scroll down to the PDF viewer below and select “Student Notes Template” and download using the link at the top of the PDF viewer.

Lesson Resources For Summing Infinite Geometric Sequences

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