In boolean algebra, there are only two possible values for a variable: true (represented by 1) and false (represented by 0). Therefore, option 3 (0.5) is not a valid value in boolean algebra.
For the other options:
- False is the same as 0 in boolean algebra.
- 0 is a valid value in boolean algebra and represents false.
- 1 is a valid value in boolean algebra and represents true. However, it is not a false correlate, as it represents the opposite value.