Discussion
Which of the following are tautologies?
Answer: D
Correct answer: Both (a) & (b)
The first is the absorption law: \( (P \lor Q) \land Q \) simplifies to Q, so the biconditional is \( Q \leftrightarrow Q \) and is always true. The second is the disjunctive syllogism: given \( P \lor Q \) and \( \lnot P \), Q must hold. The third fails when P is true and Q false, since the antecedent is then true and the consequent false.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development