Industrial Engineering and Production Management
When slack of an activity is negative

The activity is critical and any delay in its performance will delay the completion of whole project
All of these
It represents a situation where extra resources are available and the completion of project is not delayed
It represents that a programme falls behind schedule and additional resources are required to complete the project in time

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Industrial Engineering and Production Management
In order that linear programming techniques provide valid results

Only one factor should change at a time, others remaining constant
Either (A) or (B)
Relations between factors must be linear (positive)
Relations between factors must be linear (negative)

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