Industrial Engineering and Production Management
Which of the following statement is correct about the network diagram?

The events are represented graphically by circles or nodes at the beginning and the end of activity by arrows.
All of the these
The head of the arrow represents the end of an activity.
The tail end of the arrow represents the start of an activity.

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

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

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