Answer:To create a Gantt chart for the sequence 1-2-3, we need to determine the start and finish times for each job on each machine. The processing times for each job on machine A and machine B are given as follows:
Job A B
1 5 4
2 7 7
3 3 5
Based on the given sequence, we need to process job 1 first, followed by job 2 and then job 3. Therefore, we can start by scheduling job 1 on machine A.
Job Machine Start Finish
1 A 0 5
Next, we need to process job 2 on machine B, after job 1 is completed on machine A. Since job 2 takes longer to process on machine A than on machine B, we need to schedule it on machine B first.
Job Machine Start Finish
1 A 0 5
2 B 5 12
Finally, we need to process job 3 on machine A, after job 2 is completed on machine B. Since job 3 takes longer to process on machine B than on machine A, we need to schedule it on machine A first.
Job Machine Start Finish
1 A 0 5
2 B 5 12
3 A 12 15
The resulting Gantt chart is as follows:
Machine A: | 1 | | | 3 |
Machine B: | 2 | |
Time: 0 5 12 15
Therefore, the Gantt chart that shows the schedule corresponding to the sequence 1-2-3 of the jobs is as shown above.