A use a valuation tree starting with the propositional


For the propositional formula ? =((¬p) ∨((p ∧ q) ∨ (p ∧ r)))do the following.

(a) Use a valuation tree, starting with the propositional variable p, to show that ? is not a contradiction.

(b) Use a valuation tree, starting with the propositional variable p, to show that ? is not a tautology

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