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4024/11 May/Jun 2021, Question 14: Pattern Sequences and Special Sequences

Cambridge O Level Mathematics 4024 · Paper 11 (Non-calculator) · Non-calculator · 4 marks

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The question, in short

Apply two given term-to-term rules to sequences: find the next term after 1, 5, 13, and work with a sequence whose second and third terms are −1 and −4.

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Part (a) · 1 mark

Using multiply by 2 then add 3, find the term after 1, 5, 13.

  1. 113 × 2 + 3 = 29

Answer29

Part (bi) · 1 mark

Using square then subtract 5, find the fourth term given second term −1 and third term −4.

  1. 1(−4)² − 5 = 16 − 5 = 11

Answer11

Part (bii) · 2 marks

Find both possible first terms that lead to second term −1 under square then subtract 5.

  1. 1First term squared − 5 = −1
  2. 2First term squared = 4
  3. 3First term = √4 = 2 or −2

Answer2 and −2

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Also searched as: 4024/11/M/J/21 · 4024_s21_qp_11 · 4024 s21 11 · question 14.
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