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1.7 D: Sequences and series

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Question 37

An industrial kiln's control system modulates the internal temperature, TnT_nTn​ in degrees Celsius, at discrete time steps nnn. The temperature sequence T1,T2,T3,…T_1, T_2, T_3, \dotsT1​,T2​,T3​,… is defined by

Tn+1=1800−Tn T_{n+1} = 1800 - T_n Tn+1​=1800−Tn​

where T1=850T_1 = 850T1​=850 is the initial temperature reading.

Find the value of

a.

(i) T2T_2T2​

(ii) T121T_{121}T121​

[3]
b.

∑n=140(0.1Tn+5)\sum_{n=1}^{40} (0.1T_n + 5)∑n=140​(0.1Tn​+5)

[3]
Markscheme

1.7 D: Sequences and series Questions

  1. A Level
  2. /Maths
  3. /1.7 D: Sequences and series

308 exam-style questions on AQA A Level Maths 1.7 D: Sequences and series, covering 1.7.1 Binomial expansion, 1.7.2 Types of sequence (A-level only), 1.7.3 Sigma notation (A-level only), 1.7.4 Arithmetic sequences and series (A-level only), 1.7.5 Geometric sequences and series (A-level only), and 1.7.6 Sequences and series in modelling (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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