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If the sum of squares of the deviations of ranks of two players in n sports is $$\frac{2n(n + 1)}{3}$$, then the coefficient of rank correlation is
$$\frac{n - 4}{n - 1}$$
$$\frac{n - 5}{n - 1}$$
$$\frac{n - 3}{n - 1}$$
$$\frac{n - 5}{n + 1}$$
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