Question
If p (p ~q) is false, then the truth values of p and q are respectively :
Options
Solution
Key Concepts and Formulas
- Implication (): The implication is false only when is true and is false. In all other cases, it is true.
- Conjunction (): The conjunction is true only when both and are true. Otherwise, it is false.
- Negation (): The negation is true when is false, and false when is true.
Step-by-Step Solution
Step 1: Analyze the given statement We are given that is false.
Step 2: Apply the rule for implication For the implication to be false, we must have as true and as false. This is because is only false when is true and is false. Therefore, and .
Step 3: Apply the rule for conjunction Since is false, it means that it is not the case that both and are true. We already know that is true. Therefore, must be false.
Step 4: Apply the rule for negation If is false, then must be true.
Step 5: Summarize the truth values We have and .
Common Mistakes & Tips
- Remember the truth table for implication. The only case where is false is when is true and is false.
- Be careful with negation. If is false, then is true, and vice versa.
- When dealing with complex logical statements, break them down into smaller parts and analyze each part separately.
Summary
We are given that is false. This means that must be true and must be false. Since is true, for to be false, must be false. Therefore, must be true. Thus, and .
Final Answer The final answer is \boxed{T, T}, which corresponds to option (A).