1.

Which of the following well-formed formula(s) are valid?

A. (P → Q) →(Ë¥P → Ë¥Q)
B. ((P → Q)^(Q → R))→ (P → R)
C. ((P → R) v (Q → R)) → (P v Q}→R)
D. (P v (Ë¥P v Ë¥Q)) →P
Answer» D. (P v (Ë¥P v Ë¥Q)) →P


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