A fair die is rolled 2 times. Let X1 and X2 denote the number of points showing

A fair die is rolled 2 times. Let X1 and X2 denote the number of points showing on the first and second rolls, respectively. Let U=X1+X2 and V=X1-X2.(a)Find the mean and variance of V.(b)Find the covariance of U and V.(c)Show that U and V are not independent

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