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Determine the value for c and the covariance and correlation for the joint probability mass function f XY (x,y) = c(x + y) for x

Determine the value for c and the covariance and correlation for the joint probability mass function f_XY(x,y) = c(x + y) for x = 1, 2, 3 and y = 1, 2, 3.

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