Question: In a 0 - 1 integer programming model, if the constraint x 1 - x 2 0 , it means when project 2 is selected,

In a 0-1 integer programming model, if the constraint x1-x20, it means when project 2 is selected, project 1 be selected.
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 In a 0-1 integer programming model, if the constraint x1-x20, it

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