Foundation June 2018 Paper 1R Q22
22 Here are the first four terms of an arithmetic sequence.
6 10 14 18
(a) Find an expression, in terms of \(n\), for the \(n\)th term of this sequence. (2)
(b) Write down an expression, in terms of \(n\), for the \((n + 1)\)th term of this sequence. (1)
| Scheme | Marks |
|---|---|
| M1 | |
| \(4n + 2\) | A1 |
| (2) |
Notes
M1: for \(4n + k\) (\(k\) may be 0 or absent) oe
A1: oe
e.g. \(6 + (n - 1)4\)
| Scheme | Marks |
|---|---|
| \(4n + 6\) | B1 |
| (1) | |
| (3 marks) |
Notes
B1: oe ft part (a) providing M1 in part (a) is awarded
e.g. \(4(n + 1) + 2\)