Alternative Equation Formats

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MathML

\frac{\sum_{k = 1}^{K} p_{k} I_{k}}{I_{0}} N_{0}

\frac{\sum_{k = 1}^{K} p_{k} I_{k}}{I_{0}} N_{0}

\[ \frac{\sum _{k=1}^{K} \, p_{k} \, I_{k}}{I_{0}} \, N_{0} \]