UGC-NET | UGC NET CS 2017 Jan – II | Question 6

In propositional logic if (P → Q) ∧ (R → S) and (P ∨ R) are two premises such that
(P → Q) ∧ (R → S)
P ∨ R
Y
Y is the premise :
(A) P ∨ R
(B) P ∨ S
(C) Q ∨ R
(D) Q ∨ S


Answer: (D)

Explanation:

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