1MA0 Higher November 2013 Paper 2 Q8
8 Here are the first four terms of an arithmetic sequence.
3 10 17 24
(a) Find, in terms of \(n\), an expression for the \(n\)th term of this arithmetic sequence. (2)
(b) Is 150 a term of this sequence?
You must explain how you get your answer. (2)
You must explain how you get your answer. (2)
| Answer | Mark | Notes |
|---|---|---|
| \(7n - 4\) | 2 | B2 for \(7n - 4\) (B1 for \(7n + d\) where \(d\) is an integer) |
| Answer | Mark | Notes |
|---|---|---|
| explanation | 2 | M1 for ‘\(7n - 4\)’ = 150 or any other valid method, eg. counting on 7s (to get 150) A1 for a complete explanation eg. the 22nd term is 150 or \(n = 22\) from solution of equation or a clear demonstration based on 22 or complete sequence |