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The project will be completed 1 week sooner.
Tasks 4,6-7 are now 2 weeks and 3 days.
All of these
The project will not increase as task 5 and tasks 6-7 are in parallel
The project will not increase is correct as task 5 is on the critical path so duration changes directly as a result of task 5 unless task 6-7 are increased. The project will be completed 1 week sooner is correct as task 5 is decreased by 1 week. 2 weeks and 3 days is correct as task 4=3 days, 6=1 week, and 7=3 days, plus 2 additional days = 2 weeks and 3 days. (PMBOK 2013 Rev 5th Edition, pgs 177-180).
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