The precedence relations and duration (in days) of activities of a project network are given in the table. The total flot (in days) of activities e and f, respectively, are
| Activity | Predecessors | Duration (days) |
| a | - | 2 |
| b | - | 4 |
| c | a | 2 |
| d | b | 3 |
| e | c | 2 |
| f | c | 4 |
| g | d, e | 5 |
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