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Suppose X1, X2 are the number of gallons of type A and type B industrial products purchased by a company, respectively. The variances of X1

Suppose X1, X2 are the number of gallons of type A and type B industrial products purchased by a company, respectively. The variances of X1 and X2 are 2 and 1, respectively and the covariance of X1 and X2 is - 1. What is Var(3X1 - 2X2) ? O 27 O 29 O 28 O 34

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