Alternative Equation Formats

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MathML

\frac{1}{F} \sum_{i} f_{i} (r_{i} / t_{i} - {\hat{π}}_{i})^{2}

\frac{1}{F} \sum_{i} f_{i} (r_{i} / t_{i} - {\hat{π}}_{i})^{2}

$\frac{1}{F}\sum _ if_ i(r_ i/t_ i-\widehat{\pi }_{i})^2$