Question

What is the dual of (A ∧ B) v (C ∧ D)?

(a) (A V B) v (C v D)

(b) (A V B) ^ (C v D)

(c) (A V B) v (C ∧ D)

(d) (A ∧ B) v (C v D)

This question was posed to me in an online interview.

The question is from Logics and Proofs in section The Foundation: Logics and Proofs of Discrete Mathematics

Answer 1

The correct choice is (b) (A V B) ^ (C v D)

Easy explanation: In dual ∧ is replaced by v and vice – versa.