Question: 3) The constraint X1 - X2 0 within a mixed integer program allows for X1 to be selected only if X2 is selected to be

3) The constraint X1 - X2 0 within a mixed integer program allows for X1 to be selected only if X2 is selected to be a part of the optimal solution, but not both. Is this true or false?

9) A company has decided to use a mixed integer program to help make some investment decisions. There are 5 possible investment alternatives from which to choose. Suppose alternative 5 is to hire a new team, and the company finds that it can carry out at most 3 of the first four alternatives if it does not hire the new team. Let Xi = 1 if alternativei is selected and 0 otherwise fori = 1,2, 3, 4, 5. The constraint can be expressed as: _______________________

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