Foundation November 2019 Paper 3 Q14
14
(a) The term-to-term rule for a sequence is
| add 4 then divide by 2 |
The 1st term of the sequence is 36
Work out the 3rd term. [2 marks]
(b) The term-to-term rule for a different sequence is
| divide by 3 then add 10 |
The 2nd term of this sequence is 60
Work out the 1st term. [2 marks]
| Answer | Mark | Comments |
|---|---|---|
| (2nd term =) 20 | B1 | may be implied by 12 |
| (3rd term =) 12 | B1ft | ft \(\dfrac{\text{their } 20 + 4}{2}\) |
Additional guidance
| 12 with no incorrect working | B1B1 |
| 20 12 on answer line or in working with answer line blank | B1B1 |
| (20) 12 8 on answer line or in working with answer line blank | B1B0 |
| (20) 12 8 with 8 on answer line | B1B0 |
| Answer 8 without 20 or 12 seen | B0B0 |
| Answer | Mark | Comments |
|---|---|---|
| \(60 - 10\) or 50 | M1 | |
| 150 | A1 | SC1 170 or 210 or \(16.\dot{6}\) oe |
Additional guidance
| \(60 - 10\) or 50 scores M1 even if subsequent working is incorrect | |
| Accept 16.66(…) or 16.67 for \(16.\dot{6}\) | |
| Embedded answer without 150 on answer line \(\dfrac{150}{3} + 10\ (= 60)\) | M1A0 |