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 (negative)
Relations between factors must be linear (positive)
Either (A) or (B)

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

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

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