Edexcel IGCSE Math B 3.L Sequences Question Bank

Practise using nth-term formulae to generate terms, compare positions in a sequence and test whether a value can occur.

Exam points

substitute n into linear or quadratic nth-term formulae to find specified terms
calculate sums or differences between named terms, accepting direction where appropriate
set the nth term equal to a given value and decide whether n is a positive integer

[Maximum number: 1]

The nth term of a sequence is $u_{n}$ where $u_{n}=25-2 n$

Find $u_{1}$

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