Foundation November 2021 Paper 3 Q20
20 The \(n\)th term of a sequence is \(\quad 19 - 4n\)
What is the smallest value of \(n\) that gives a negative term? [2 marks]
| Answer | Mark | Comments |
|---|---|---|
| 15, 11, 7, 3 as the first four terms or \(19 - 4 \times 5\) or \(19 - 20\) or \(-1\) as the first negative term or 4.75 | M1 | oe |
| 5 | A1 |
Additional guidance
| \(5n\) on answer line with 5 in working | M1A0 |
| \(n = -1\) without correct working for M1 | M0 |
| \(4.75n\) on answer line with no correct M1 values | M0 |
| \(19 - 4n < 0\) with no correct M1 values | M0 |