For linear programming to work for project crashing decisions, a dummy activity is needed at the beginning of the project, with a duration of zero (0) time.

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Quizplus · Accepted Answer

In linear programming for project crashing, dummy activities are used to represent precedence relationships between tasks, not necessarily at the beginning of the project, and their duration is not relevant to their purpose.

For Linear Programming to Work for Project Crashing Decisions, a Dummy