Which of the following Boolean expression is a tautology?

(i) (p^q) v (pvq)

(ii) (p^q) v (p→q)

(iii) (p^q) ^ (p→q)

(iv) (p^q) → (p→q)

a) 

For the statement p and q, consider the following compound statements:

B. {(pvq)^-p} → q

Then which of the following statement is correct:

(i) A is a tautology but not B

(ii) A and B both are not tautologies

(iii) A and B both are tautologies

(iv) B is a tautology but not A

Evaluate