CAPE Pure Mathematics Unit 1 · 2008 (T&T) · Paper 1 · Question Q3
Which of the following statements is true?
- (A)
\sum_{r=1}^{n} r^2 = \frac{1}{2} n(n+1) - (B)
\sum_{r=1}^{n} r^2 = \sum_{r=0}^{n} r^2 - (C)
\sum_{r=1}^{n} r^2 = \left[\sum_{r=1}^{n} r\right]^2 - (D)
\sum_{r=1}^{n} (2 + r^2) = 2 + \sum_{r=1}^{n} r^2
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