Foundation June 2023 Paper 2 Q16
16 A linear sequence starts
\[7 \qquad 10 \qquad 13 \qquad 16\]Work out an expression for the \(n\)th term of the sequence. [2 marks]
| Answer | Mark | Comments |
|---|---|---|
| \(3n + 4\) or \(4 + 3n\) | B2 | oe eg \(7 + (3n - 3)\) B1 \(3n\ (+ \ldots)\) or \(3n\ (- \ldots)\) |
Additional guidance
| Ignore LHS of formula given eg \(\mathrm{T}_n = 3n + 4\) | B2 |
| Condone \(n = 3n + 4\) or \(n\)th term \(= 3n + 4\) | B2 |
| Allow a multiplication sign eg \(3 \times n + 4\) or \(n \times 3 + 4\) | B2 |
| Allow other variables eg \(3x + 4\) | B2 |
| \(3x\) | B1 |
| \(n3 \ldots\) | B1 |
| \(n3 + 4\) | B1 |
| \(3n\)th \(+ 4\) | B1 |
| \(3n\)th | B0 |
| \(3n + 4n\) | B0 |