Intermediate June 2022 Unit 1 Q13
13. Write down an expression for the \(n\)th term of the following sequence. [2]
15, 9, 3, –3, ....
| Scheme | Marks | Comments |
|---|---|---|
| \(-6n + 21\) or equivalent | B2 | B1 for sight of -\(6n\). If no marks, award SC1 for \(6n + 21\). |