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

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

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Industrial Engineering and Production Management
Activity slack or float of any event on a PERT/CPM chart is represented by

Latest start time of succeeding event earliest finish time of preceding event activity time
Latest start time of the event earliest start time of the event
Anyone of the above
Latest finish time of event earliest finish time of the event

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