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

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

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

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

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