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4MA1/2FR Jun 2020, Question 3: Exponential Sequences

Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2FR (Foundation) · Calculator · 3 marks

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The question, in short

Sequence starts 1, 3, 9, 27, 81. Find the next term, explain the method, and use the 9th term 6561 to find the 10th term.

Summarised in our own words. Use the official paper for the exact wording and any diagrams.

Part (a) · 1 mark

Find the term that follows 81 in the sequence 1, 3, 9, 27, 81.

  1. 181 × 3 = 243

Answer243

Part (b) · 1 mark

Describe the rule or method used to obtain the next term.

  1. 1Each term is obtained by multiplying the previous term by 3

AnswerMultiplying previous term by 3

Part (c) · 1 mark

Given the 9th term is 6561, work out the 10th term of the sequence.

  1. 16561 × 3 = 19683

Answer19683

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