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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

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 an invalid order?
  1. A, B, C, D, E
  2. B, A, C, D, E
  3. C, A, B, D, E
  4. A, C, B, D, E

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 an invalid order?
  • Step 1: Identify the tasks: A, B, C, D, and E.
  • Step 2: Understand the requirements: A and B must be completed before C.
  • Step 3: Note that C must be completed before D.
  • Step 4: Determine the implications: Since A and B must be done before C, C cannot come before A or B.
  • Step 5: Analyze the order C, A, B, D, E: In this order, C comes before A and B, which violates the requirement.
  • Step 6: Conclude that the order C, A, B, D, E is invalid.
  • Task Dependency – Understanding the order in which tasks must be completed based on given prerequisites.
  • Logical Sequencing – The ability to determine valid sequences based on conditions provided.
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