1MA0 Higher November 2014 Paper 2 Q7
7 Here are the first five terms of an arithmetic sequence.
2 6 10 14 18
(a) Write down an expression, in terms of \(n\), for the \(n\)th term of this sequence. (2)
*(b) Is 86 a term in the sequence?
You must give a reason for your answer. (1)
You must give a reason for your answer. (1)
| Answer | Mark | Notes |
|---|---|---|
| \(4n - 2\) | 2 | B2 for \(4n - 2\) oe (B1 for \(4n + k\), \(k \neq -2\) or \(k\) is absent, or \(n = 4n - 2\)) |
| Answer | Mark | Notes |
|---|---|---|
| Yes + reason | 1 | C1 ft from (a) for decision and explanation, e.g. equating 86 with nth term and “Yes, its the 22nd term” or continuing the sequence up to 86 and “Yes, 86 is in the sequence” oe |