Alternative Equation Formats

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MathML

r = \sum_{1 \leq i \leq j \leq n} R_{i, j}^{2}

r = \sum_{1 \leq i \leq j \leq n} R_{i, j}^{2}

\[ r=\sum _{1 \leq i \leq j \leq n} R_{i,j}^2 \]