Alternative Equation Formats

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MathML

S^{d} = \sum_{k = 1}^{K} \sum_{j = 1}^{N_{k}} X_{k, j}^{d}

\[ S^{d} = \sum _{k=1}^{K} \sum _{j=1}^{N_ k} X_{k,j}^{d} \]