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Reported Question / Answer
Q.) Which of the following well-formed formula(s) are valid?
1)
(P → Q) →(Ë¥P → Ë¥Q)
2)
((P → Q)^(Q → R))→ (P → R)
3)
((P → R) v (Q → R)) → (P v Q}→R)
4)
(P v (Ë¥P v Ë¥Q)) →P
5)
NULL
Answer :
2
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Human Verification : Answer 2 + 3 = ?
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