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4MA1/2F Nov 2021, Question 6: Linear Sequences and Common Difference

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

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The question, in short

Given the sequence 4, 8, 12, 16, find the following term, describe the method used, and give a formula for the nth term in terms of n.

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

Part (a) · 1 mark

State the term that comes after 16 in the sequence.

  1. 116 + 4 = 20

Answer20

Part (b) · 1 mark

Describe the reasoning that led to your answer in part (a).

  1. 1The difference between each term is 4
  2. 2Each term increases by 4

Answeradd 4

Part (c) · 1 mark

Write a formula using n that produces the nth term of the sequence.

  1. 1The terms go up by 4, so the nth term starts 4n
  2. 2n = 1 gives 4, which matches, so nth term = 4n

Answer4n

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