To determine which number is not part of the solution set for the inequality \( z/2 \neq 6 \), we can first simplify the inequality.
Starting from the equation: \[ z/2 \neq 6 \]
To isolate \( z \), multiply both sides by 2: \[ z \neq 12 \]
So, the value that \( z \) cannot be is 12. Now we can check the numbers given:
- 6: does not equal 12
- 12: equals 12
- 2: does not equal 12
- 3: does not equal 12
Therefore, the number that is not part of the solution set is 12.