Geometric and mixed sums
Geometric and mixed sums
3 marks
Tim Gan Math Original
Simplify \(\sum_{r=2}^{n}3^r\) in terms of \(n\).[3]
Take \(n\) to be an integer with \(n\ge 2\).
Solution:
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Answer:\(\frac{3^{n+1}-9}{2}\)
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