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Que. In propositional logic P ⇔ Q is equivalent to (Where ~ denotes NOT):
a. ~ (P ˅ Q) ˄ ~ (Q ˅ P)
b. (~ P ˅ Q) ˄ (~ Q ˅ P)
c. (P ˅ Q) ˄ (Q ˅ P)
d. ~ (P ˅ Q) → ~ (Q ˅ P)
Answer:(~ P ˅ Q) ˄ (~ Q ˅ P)

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