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Solve the following 3 variable problem in Excel. Maximize 10X1 + 7X2 + 5X3; subject to the constraints: X1 + X2 + X3 = 70;

Solve the following 3 variable problem in Excel. Maximize 10X1 + 7X2 + 5X3; subject to the constraints: X1 + X2 + X3 <= 100; 2X2 + X3 >= 70; -X2 + X3 <= 150. All variables are non-negative. Which of the following statements is true?

The slack variable for 2X2 + X3 >= 70 is positive
The problem is infeasible.
The slack variable for X1 + X2 + X3 <= 100 is zero.
The slack variable for X2 + X3 <= 150 is zero.

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