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

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

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Industrial Engineering and Production Management
Pessimistic time is

The maximum time which an activity might require
The most probable time considering all conditions
The minimum time in which an activity can possibly be accomplished
The average time required for a job

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