In a 0-1 integer programming model, if the constraint x1

Question

In a 0-1 integer programming model, if the constraint x1 - x2 = 0, it means when project 1 is selected, project 2 ________ be selected.
A) can also
B) can sometimes
C) can never
D) must also

Quizplus · Accepted Answer

The constraint x1 - x2 = 0 in a 0-1 integer programming model means that the values of x1 and x2 must be equal. Since x1 and x2 can only take values 0 or 1, if project 1 (x1) is selected (x1=1), then project 2 (x2) must also be selected (x2=1) to satisfy the constraint.