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If X and Y are random variables with variances Var(x) = 2, Var(y) = 4 and the covariance sigma_XY = - 2. Find the variance
If X and Y are random variables with variances Var(x) = 2, Var(y) = 4 and the covariance sigma_XY = - 2. Find the variance of 3X +4Y, which is Var(3x + 4y). Show your result as an integer
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