Alternative Equation Formats

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MathML

S_{k, j - 1} = \sum_{l = 1}^{j - 1} X_{k, l}

S_{k, j - 1} = \sum_{l = 1}^{j - 1} X_{k, l}

$S_{k,j-1} = \sum _{l=1}^{j-1} X_{k,l}$