- #1

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Given that:

[tex]\sum_{n=1}^{N}s_{n} = 1[/tex]

The author says that:

[tex]\sum_{n=1}^{N}(s_{n} - \frac{1}{N})^{2} = \sum_{n=1}^{N}s_{n}^{2} - \frac{1}{N}[/tex]

I seem to be having some trouble getting this to work. Am I just missing something? Or is this the author's mistake? Thanks!