1.

Given the following two statements : (S1) : (q ∨ p) → (p ↔ ~ q) is a tautology. (S2) : ~ q ∧ (~ p ↔ q) is a fallacy. Then : (1) only (S1) is correct. (2) both (S1) and (S2)  are correct. (3) both (S1) and (S2) are not correct. (4) only (S2) is correct.

Answer»

(3) both (S1) and (S2) are not correct. 

Let TV(r) denotes truth value of a statement r. 

Now, if TV(p) = TV(q) = T 

TV(S1) = F 

Also, if TV(p) = T & TV(q) = F 

TV(S2) = T



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