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activities g, p, and r are the immediate predecessors for activity w. if the earliest finish times for the three are 12, 15, and 10, then the earliest start time for w a. is 10. b. is 12. c. is 15. d. cannot be determined.

User Aahnik
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The earliest start time for activity w can be determined by taking the maximum of the earliest finish times of its immediate predecessors, which are activities g, p, and r. In this case, the maximum is 15. Therefore, the correct answer is c. is 15.

User Exprator
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