Mixed diagonal second moment of the inverse Wishart matrix: $\mathbb{E}[(W^{-1})_{ii}(W^{-1})_{jj}] = (k-r-2)/((k-r)(k-r-1)(k-r-3))$, $i\neq j$

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Mixed diagonal second moment of the inverse Wishart matrix: $\mathbb{E}[(W^{-1})_{ii}(W^{-1})_{jj}] = (k-r-2)/((k-r)(k-r-1)(k-r-3))$, $i\neq j$ · Prove2Me