Question: Prove that the second equality in Cov ( x , Y ) = E{ X - E ( X ) ] [ Y - E

Prove that the second equality in Cov ( x , Y ) = E{ X - E ( X ) ] [ Y - E ( Y ) ]] - E( XY ) - E(X) E(Y) holds for the case in which X is a discrete random variable having range (x1, x2, ... } and Y is a discrete random variable having range (y1, y2 ... 1

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