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Question
Statement: "If P then Q" is TRUE. Which is also definitely TRUE?
Answer
✅ **Contrapositive: "If NOT Q, then NOT P"** P → Q ≡ ¬Q → ¬P NOT equivalent: - Q → P (converse) ❌ - ¬P → ¬Q (inverse) ❌ 💡 Only the contrapositive preserves truth. This is the #1 logic rule to memorize.
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