Industrial Engineering and Production Management
Pessimistic time is

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

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Industrial Engineering and Production Management
The important file in making a PERT is

An event can't be accomplished until activities leading to it are completed
Length of arrow has nothing to do with time
No activity from any event can be started from preceding event till it is completed
All of the these

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