Summing Arithmetic Sequences | Year 2 Pure | A Level Maths
Summing an arithmetic sequence is a classic A-level technique and the proof of the formula is itself examinable. In this lesson you will learn how to use the sum formulae S_n = (n/2)(2a + (n — 1) d) and S_n = (n/2)(a + l), present the derivation as a proof, and apply the formulae including to the sum of the first n natural numbers. The lesson covers sigma notation, mixed arithmetic problems and modelling with arithmetic sequences.
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Lesson Video On Summing Arithmetic 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 Arithmetic Sequences
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