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?
Practice Questions
1 question
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?
A, B, C, D
D, C, A, B
B, A, D, C
C, D, A, B
The only valid sequence is D, C, A, B, as it respects the constraints given.
Questions & Step-by-step Solutions
1 item
Q
Q: 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?
Solution: The only valid sequence is D, C, A, B, as it respects the constraints given.
Steps: 6
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.
