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

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

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Industrial Engineering and Production Management
Pick up the incorrect statement about advantages of work sampling

Permits a fine breakdown of activities and delays
No time measuring devices are generally needed
Calculations are easier, method is economical and less time consuming
Simultaneous study of many operators may be made by a single observer

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