Question
Determine whether the following statement patterns are tautologies contradictions or contingencies : [(p ∨ ~q) ∨ (~p ∧ q)] ∧ r
✓
Answer
The entries in the last column are neither T nor all F.
∴ [(p ∨ ~q) ∨ (~p ∧ q)] ∧ r is a contingency.
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