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Edexcel IGCSE Math A 3.1.C nth term of linear sequences

Practise nth-term questions by finding the common difference, building the expression in n and using it to calculate or reject terms.

Syllabus
First assessment 2018
Course
Math A 4MA1
Level
Foundation

Exam points

  • Find an expression for the nth term of a linear sequence using the common difference.
  • Use the nth-term expression to calculate a specified term such as the 12th term.
  • Explain why a number cannot be a term by substituting or solving for n.

3.1.C nth terms of arithmetic sequences question 1

[Maximum number: 1]

Here is a sequence of patterns.

Figure for Question 3.1.C nth terms of arithmetic sequences question 1 — Edexcel IGCSE Math A Foundation

Pattern number 1 is made from 1 white dot.
All other patterns are made from black dots and white dots.

Work out the total number of dots in this pattern.

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