If p and q are propositions then p --> q is logically equivalent to
1.p AND q
2.~p OR q
3.~p AND q
4.p OR ~q
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2 is correct
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A compound proposition that is always True is called a tautology. Two propositions p and q are logically equivalent if their truth tables are the same. Namely, p and q are logically equivalent if p ↔ q is a tautology. If p and q are logically equivalent, we write p ≡ q.
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