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The project will increase by 3 days as tasks 6-7 are in series.
None of these
The project will not increase as task 5 and tasks 6-7 are in parallel.
The project tasks 6-7 and 5 are in parallel, now equal, and there is no change to duration of project.
Increase by 3 days is incorrect as tasks 6-7 are in parallel with task 5; task 5 is still longest duration so overall there is no affect on project. Tasks 6-7 equal with 5 is incorrect as tasks 6-7 and task 5 are not equal but less then task 5. There is no affect on project since task 6-7 are still parallel with task 5. (PMBOK 2013 Rev 5th Edition, pgs 177-180).
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