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Sequences and Series

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Question 163

A robotic arm moves along a linear track. Its position pnp_npn​ (in cm) at step n n\,n is governed by the recurrence relation:

pn+1=3−(pn)2 p_{n+1} = 3 - (p_n)^2 pn+1​=3−(pn​)2
a.

In the case where the arm starts at p1=2p_1 = 2p1​=2:

(i) Find the value of p3p_3p3​.

(ii) Determine the value of p100p_{100}p100​.

[4]
b.

State a different value for p1p_1p1​, other than p1=2p_1 = 2p1​=2, which gives the same value for p100p_{100}p100​ as found in part (a)(ii).

[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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