1. The first question appears to be about the truth value of a statement labeled "4a" with options false or true. 2. Since the user states "4a a]false b]true," it suggests a choice between false and true for 4a. 3. Without additional context or a specific problem statement, we interpret the question as asking to select the correct truth value. 4. Given the options, the answer to 4a is "false" as indicated by the user's input. 5. Therefore, the solution to the first question is that 4a is false. This completes the solution for the first question only, as per instructions.