Discussion
(P v Q) ^ (P → R )^ (Q →S) is equivalent to
Answer: C
Correct answer: S v R
This is the constructive dilemma. \( P \lor Q \) guarantees that at least one of P and Q holds; if P holds then \( P \to R \) gives R, and if Q holds then \( Q \to S \) gives S. Either way at least one of R and S is true, which is exactly \( S \lor R \). Nothing stronger follows, since neither R nor S is guaranteed on its own.
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