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Question

Which of the following is De-Morgan’s law?

a.

P ∧ (Q v R) Ξ (P ∧ Q) v (P ∧ R)

b.

~(P ∧ R) Ξ ~P v ~R, ~(P v R) Ξ ~P ∧ ~R

c.

P v ~P Ξ True, P ∧ ~P Ξ False

d.

None of the mentioned

Answer: (b).~(P ∧ R) Ξ ~P v ~R, ~(P v R) Ξ ~P ∧ ~R

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