Alternative Equation Formats

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MathML

c = \sum_{r = 1}^{k} \frac{p_{k} (p_{k} + 1 + 2 δ_{k})}{2}

c = \sum_{r = 1}^{k} \frac{p_{k} (p_{k} + 1 + 2 δ_{k})}{2}

\[ c = \sum _{r=1}^ k \frac{p_ k (p_ k + 1 + 2 \delta _ k)}{2} \]