Correct Answer - Option 3 : n - 2
Explanation:
In any network, there can be only one initial and one final event then if there are n number of events in the networks diagram then the number of dual role event = n – initial event – final event
= n – 2
A few important definitions which are used in Project Management Techniques like CPM or PERT are specified below:
1. Event: It is a stage that refers to a particular instant of time that indicates the starting or completion of an activity. The occurrence of an event neither requires time nor any other resources. Example: excavation started, beam cast is some events.
2. Tail and End event: An event that marks the starting of an activity called tail event and an event that marks the completion of an activity called end event.
3. Dual Role event: An event that acts as both tail and end event is called a dual role event.
4. Activity: It is the actual performance of the task which requires resources like time and cost for its completion.
