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1.4.5 Sequences (A-level only)

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Question 14

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]

1.4.5 Sequences (A-level only) Questions

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