Final answer:
The value of Y that will generate a mathematical error and prevent the flowchart from being completely executed is 0 (zero).
Step-by-step explanation:
The value of Y that will generate a mathematical error and prevent the flowchart from being completely executed is 0 (zero).
This can be seen in the flowchart where the division operation is performed: if Y is 0, dividing by 0 will result in an error (division by zero is undefined in mathematics). When an error occurs, the flowchart cannot proceed and the program terminates.
For example, if Y = 0 in the flowchart, the division operation 10 / 0 will result in an error and the flowchart will not execute any further.