December2015 Cs Q9
- Option : D
- Explanation :
- p ∨ ~(p ∧ q) = p + (pq)` = p + p` + q` = 1 + q` = 1.This is a tautology.
- (p ∧ ~q) ∨ ~(p ∧ q) = pq` + (pq)` = pq` + p` + q` = p` + q`.
- This is not a tautology. p ∧ (q ∨ r) = pq + pr. This is not a tautology.
