Edexcel IGCSE Math A Foundation 3.1 C Nth Terms of Arithmetic Sequences Questions

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

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.

[Maximum number: 1]

Here is a sequence of patterns.

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

One pattern in the sequence is made with exactly 20 black dots.

Work out the total number of dots in this pattern.

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