Foundation June 2017 Unit 2 Q17
17.
(a) Write down the first three terms of the sequence whose \(n\)th term is given by \(2n - 5\). [2]
The first three terms are …………… , …………… and ……………
The first three terms are …………… , …………… and ……………
(b) Write down an expression for the \(n\)th term of the following sequence. [2]
7, 11, 15, 19, ...
| Scheme | Marks | Comments |
|---|---|---|
| −3, −1 and 1 | B2 | B1 for any two correct in the correct positions OR B1 for −5, −3 and −1 OR B1 for –1, 1 and 3. |
| Scheme | Marks | Comments |
|---|---|---|
| 4n + 3 | B2 | B1 for sight of 4n or n4 (but not 4nk k≠1). Mark final answer. |