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If var X1 5 var X2 4 var X3 7

If var(X1) = 5, var(X2) = 4, var(X3) = 7, cov(X1, X2) = 3, cov(X1, X3) = –2, and X2 and X3 are independent, find the covariance of Y1 = X1 – 2X2 + 3X3 and Y2 = –2X1 + 3X2 + 4X3.

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