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1.6.15 Standard formulae for geometric series (A-level only)

1.6.15 Standard formulae for geometric series (A-level only)

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Question 8

Consider the finite geometric series defined by the summation ∑i=0n−1ARi\sum_{i=0}^{n-1} A R^i∑i=0n−1​ARi.

Prove that the sum Sn S_n\,Sn​ of this series is given by the formula

Sn=A(1−Rn)1−R S_n = \frac{A(1 - R^n)}{1 - R} Sn​=1−RA(1−Rn)​
[4]
Markscheme

1.6.15 Standard formulae for geometric series (A-level only) Questions

  1. A Level
  2. /Maths
  3. /1.6.15 Standard formulae for geometric series (A-level only)

22 exam-style questions on OCR (MEI) A Level Maths 1.6.15 Standard formulae for geometric series (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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