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In a scheduling set involving four tasks A, B, C, and D, if task A must be compl

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Question: In a scheduling set involving four tasks A, B, C, and D, if task A must be completed before task B, and task C cannot start until task D is finished, which of the following sequences is valid?

Options:

  1. A, B, C, D
  2. D, C, A, B
  3. B, A, D, C
  4. C, D, A, B

Correct Answer: D, C, A, B

Solution: 

The only valid sequence is D, C, A, B, as it respects the constraints given.

In a scheduling set involving four tasks A, B, C, and D, if task A must be compl

Practice Questions

Q1
In a scheduling set involving four tasks A, B, C, and D, if task A must be completed before task B, and task C cannot start until task D is finished, which of the following sequences is valid?
  1. A, B, C, D
  2. D, C, A, B
  3. B, A, D, C
  4. C, D, A, B

Questions & Step-by-Step Solutions

In a scheduling set involving four tasks A, B, C, and D, if task A must be completed before task B, and task C cannot start until task D is finished, which of the following sequences is valid?
  • Step 1: Identify the tasks involved: A, B, C, and D.
  • Step 2: Understand the constraints: Task A must be completed before Task B (A -> B), and Task C cannot start until Task D is finished (D -> C).
  • Step 3: List the possible sequences of tasks while respecting the constraints.
  • Step 4: Check the sequence D, C, A, B: Task D is completed first, then Task C can start, followed by Task A, and finally Task B.
  • Step 5: Verify if any other sequences can work: Any sequence that places A after B or C before D would violate the constraints.
  • Step 6: Conclude that the only valid sequence is D, C, A, B.
  • Task Dependency – Understanding the order in which tasks must be completed based on given constraints.
  • Scheduling – The process of arranging tasks in a sequence that respects their dependencies.
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