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Given the tasks A, B, C, D, and E, if A and B must be done before C, and C must

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Question: Given the tasks A, B, C, D, and E, if A and B must be done before C, and C must be done before D, which of the following is a possible order?

Options:

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

Correct Answer: A, B, C, D, E

Solution: 

The order A, B, C, D, E satisfies all the constraints that A and B are before C, and C is before D.

Given the tasks A, B, C, D, and E, if A and B must be done before C, and C must

Practice Questions

Q1
Given the tasks A, B, C, D, and E, if A and B must be done before C, and C must be done before D, which of the following is a possible order?
  1. D, C, A, B, E
  2. A, B, C, D, E
  3. C, A, B, D, E
  4. B, A, E, C, D

Questions & Step-by-Step Solutions

Given the tasks A, B, C, D, and E, if A and B must be done before C, and C must be done before D, which of the following is a possible order?
  • Step 1: Identify the tasks: A, B, C, D, and E.
  • Step 2: Understand the constraints: A and B must be completed before C, and C must be completed before D.
  • Step 3: List the tasks in an order that respects the constraints.
  • Step 4: Start with A and B since they must be done before C.
  • Step 5: Place C after A and B because it cannot be done until both are finished.
  • Step 6: Place D after C because it cannot be done until C is finished.
  • Step 7: Finally, place E at the end since it has no constraints related to A, B, C, or D.
  • Step 8: The order A, B, C, D, E satisfies all the constraints.
  • Task Dependency – Understanding the sequence in which tasks must be completed based on given constraints.
  • Topological Sorting – Arranging tasks in a linear order that respects their dependencies.
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