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Sequences and Series

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Question 150

The temperature TnT_nTn​ (in ∘C{^\circ}\text{C}∘C) inside a specialized climate-controlled incubator on day n n\,n is modeled by the recurrence relation:

Tn+1=13−Tn2,n≥1 T_{n+1} = 13 - T_n^2, \quad n \ge 1 Tn+1​=13−Tn2​,n≥1
a.

In the case where the initial temperature is set to T1=4T_1 = 4T1​=4:

(i) Calculate the value of T3T_3T3​.

(ii) Deduce the value of T100T_{100}T100​.

[4]
b.

State a different value for T1T_1T1​, other than T1=4T_1 = 4T1​=4, which would result in the same value for T100T_{100}T100​ as found in part (a)(ii). Justify your answer.

[2]
Markscheme

Sequences and Series Questions

  1. A Level
  2. /Maths
  3. /Sequences and Series

326 exam-style questions on Edexcel A Level Maths Sequences and Series, covering 3.1 Arithmetic Sequences, 3.2 Arithmetic Series, 3.3 Geometric Sequences, 3.4 Geometric Series, 3.5 Sum to Infinity, 3.6 Sigma Notation, 3.7 Recurrence Relations, and 3.8 Modelling with Series. Each one has a worked solution and a mark scheme showing where the marks go.

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