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Activity 1 has a completion time of 6 or 11 days, each with a 50% probability. Activity 2 has a completion time of 11 or

Activity 1 has a completion time of 6 or 11 days, each with a 50% probability. Activity 2 has a completion time of 11 or 15 days, each with a 50% probability. Both activities 1 and 2 can start immediately and must be completed before activity 3, which has a deterministic duration of 4 days.

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