Example 7 - Find sum of first n terms and of first 5 terms
![Grade 11 Maths: Arithmetic Sequences] Which sum formula do I use : r/HomeworkHelp](https://preview.redd.it/j94x5fpd5mm41.png?width=475&format=png&auto=webp&s=d3ef0b5d954fdbbd30949b861fe1d2236cb51495 "Grade 11 Maths: Arithmetic Sequences] Which sum formula do I use : r/HomeworkHelp")
Grade 11 Maths: Arithmetic Sequences] Which sum formula do I use : r/HomeworkHelp
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