OCR MEI C2 2011 January — Question 1 2 marks

Exam BoardOCR MEI
ModuleC2 (Core Mathematics 2)
Year2011
SessionJanuary
Marks2
PaperDownload PDF ↗
Mark schemeDownload PDF ↗
TopicArithmetic Sequences and Series
TypeSigma notation: direct numerical evaluation
DifficultyEasy -1.2 This is a straightforward calculation requiring only direct substitution of r = 3, 4, 5, 6 into 12/r and adding the results. No formula manipulation or problem-solving is needed—just arithmetic with fractions, making it easier than average.
Spec1.04g Sigma notation: for sums of series
1 Calculate \(\sum _ { r = 3 } ^ { 6 } \frac { 12 } { r }\).
Question 1:
AnswerMarks Guidance
AnswerMark Guidance
\(11.4\) o.e.2 M1 for \(\frac{12}{3} + \frac{12}{4} + \frac{12}{5} + \frac{12}{6}\) o.e. 
**Question 1:**

| Answer | Mark | Guidance |
|--------|------|----------|
| $11.4$ o.e. | **2** | **M1** for $\frac{12}{3} + \frac{12}{4} + \frac{12}{5} + \frac{12}{6}$ o.e. | **M0** unless four terms summed |

---
1 Calculate $\sum _ { r = 3 } ^ { 6 } \frac { 12 } { r }$.

\hfill \mbox{\textit{OCR MEI C2 2011 Q1 [2]}}
This paper (12 questions)
View full paper
Q1 2 Q2 4 Q3 3 Q4 4 Q5 5 Q6 5 Q7 4 Q8 5 Q9 4 Q10 12 Q11 11 Q12 13