Here are the first five terms of an arithmetic sequence.
21, 27, 33, 39, 45
Show that 6n+156n + 156n+15 is an expression, in terms of nnn, for the n n\,nth term of the sequence.
208 exam-style questions on AQA GCSE Maths Sequences (Nth Term). Each one has a worked solution and a mark scheme showing where the marks go.