Foundation November 2024 Paper 2 Q8
8
(a) A sequence is generated using the rule:
- multiply the previous term by 3
- then subtract 1.
The 2nd term of the sequence is 20.
(i) Find the 3rd term of the sequence. [1]
(ii) Find the 1st term of the sequence. [2]
(b) Here are the first four terms of a different sequence.\[5 \qquad 10 \qquad 15 \qquad 20\]
Find the \(n\)th term of the sequence. [1]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| (i) 59 | 1 | Condone extra correct terms e.g. 176, ... | |
| (ii) 7 | 2 | M1 for add 1 then divide by 3 soi | Allow embedded answer for M1: e.g.: \(7 \times 3 - 1 = 20\) |
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| \(5n\) oe | 1 | Condone poor notation e.g. \(5 \times n\), \(n = 5n\), \(5n + 0\), \(5n - 0\). oe e.g. \(n + n + n + n + n\) | |