| Exam Board | OCR MEI |
|---|---|
| Module | C2 (Core Mathematics 2) |
| Marks | 2 |
| Paper | Download PDF ↗ |
| Mark scheme | Download PDF ↗ |
| Topic | Arithmetic Sequences and Series |
| Type | Sigma notation: direct numerical evaluation |
| Difficulty | Easy -1.2 This is a straightforward sigma notation evaluation requiring only substitution of r=3,4,5,6 into r(r+2) and adding the results. It's a direct application of sigma notation with no algebraic manipulation needed, making it easier than average but not trivial since it requires careful arithmetic across four terms. |
| Spec | 1.04g Sigma notation: for sums of series |
| Answer | Marks | Guidance |
|---|---|---|
| \(3\times(3+2) + 4\times(4+2) + 5\times(5+2) + 6\times(6+2)\) | M1 | oe; B2 for 122 unsupported |
| 122 www | A1 |
## Question 11:
| $3\times(3+2) + 4\times(4+2) + 5\times(5+2) + 6\times(6+2)$ | M1 | oe; **B2** for 122 unsupported |
| 122 www | A1 | |11 Find $\sum _ { r = 3 } ^ { 6 } r ( r + 2 )$.
\hfill \mbox{\textit{OCR MEI C2 Q11 [2]}}