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please help thanks Using properties of sums and the definition provided in the slides, show that if X and Y are two discrete random variables,

please help thanks

Using properties of sums and the definition provided in the slides, show that if X and Y are two discrete random variables, then the covariance between them is cov(X, Y) = _xyP(x, y) - Axlly. X Here, Hx = E(X) and My = E(Y)

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