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A project is represented by the activity durations (in days, estimated at 90% likelihood of completion)...

A project is represented by the activity durations (in days, estimated at 90% likelihood of completion) and precedence requirements shown in the table. How many project buffers are needed if this project is managed using critical chain methodology?

Activity Predecessor Length Activity Predecessor Length
A -- 18 E C, D 13
B -- 16 F C 9
C A 22 G E, F 15
D B 14 ​ ​ ​

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