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

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

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Industrial Engineering and Production Management
The reasons which are basically responsible for the formation of a queue should be that

The average service rate Hess than the average arrival rate
Output rate is linearly proportional to input
All of these
Output rate is constant and the input varies in a random manner

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