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constraint. If we are solving a 0-1 integer programming problem, the constraint x1 + x2 = 1 is called a multiple-choice mutually exclusive conditional corequisite 000 Binary variables are: O any integer value. any negative integer value. any continuous value. 0 0 or 1 only In a integer model, some decision variables must have integer values and other decision variables can have non-integer values. total 0-1 mixed All of these be In a 0-1 integer programming model, if the constraint x1 - x2 50, it means when project 2 is selected (i.e., has value of one), then project 1 selected. O must always can never O is already can sometimes