Alternative Equation Formats

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MathML

= \sum_{i = 1}^{k + 1} (i - 1) {\hat{π}}_{i}

= \sum_{i = 1}^{k + 1} (i - 1) {\hat{π}}_{i}

$= \sum _{i=1}^{k+1}(i-1){\widehat{\pi }}_ i$