based on the valid argument form. If the argument is invalid, give truth-value assignments (i.e. 'p is true/false') for each variable that could be used to construct a counterexample. If there are multiple possibilities,just give one. (15 points each) 1. pvq \text { 2. } p \Longrightarrow r \text { 3. } q \Longrightarrow r \therefore 4 . r \text { 1. }(p \wedge q) \Longrightarrow r \text { 2. } p \vee q \therefore 3 . r

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