CAPE Pure Mathematics Unit 2 · May/June 2019 · Paper 1 · Question Q31
Which of the following statements is true?
- (A)
\sum_{r=1}^n r^2 = 2\sum_{r=1}^n r - (B)
\sum_{r=1}^n r^2 = \left[\sum_{r=1}^n r\right]^2 - (C)
\sum_{r=1}^n (2 + r^2) = 2 + \sum_{r=1}^n r^2 - (D)
\sum_{r=1}^n r^2 = \sum_{r=0}^n r^2
The answer is shown once you've answered.
Practise this question