If project 5 must be completed before project 6,the constraint would be x₅ − x₆ ≤ 0.

Question

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The correct constraint to ensure project 5 is completed before project 6 would typically be in the form of x₅ ≤ x₆, indicating that the start or completion time of project 5 is before or equal to the start or completion time of project 6. The given constraint seems to be incorrectly formulated for this purpose.

If Project 5 Must Be Completed Before Project 6,the Constraint