Industrial Engineering and Production Management
A feasible solution to the linear programming problem should

Satisfy the non-negativity restrictions
Optimise the objective function
Satisfy the problem constraints and non-negativity restrictions
Satisfy the problem constraints

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

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

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