Each activity in a project can be performed by two different resource combinations (Table 4). Assume that the usage rate of each resource is constant throughout the duration of each activity. Now find a schedule that minimizes the time required to complete the project. Resources I and II both are available at a level of 12 hours each day.

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TABLE 4 Immediate predecessors Mode 1 Duration (days) Resource I required (hours/activity) Resource II required (hours/activity) Mode 2 Duration (days) Resource I required (hours/activity) Resource II required (hours/activity) A 205 1 12 7 B A 3 9 6 228 12 C A 5 10 5 4 8 16 Activity D 3 6 9 262 12 E B, C 2 8 6 1 5 F D, E 143 3 143