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incorrect denominator

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incorrect denominator

The expected number of comparisons is therefore

$\displaystyle \sum_{i=1}^{n}\sum_{j>i}^{n}p_{ij}$ $\displaystyle =$ $\displaystyle \sum_{i=1}^{n}\sum_{j>i}^{n}\frac{2}{j-i+1}$

(i changed j-i-1 to j-i+1)

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