Question: Indicate whether the argument is valid or invalid. For valid arguments, prove that the argument is valid using a truth table. For invalid arguments give

Indicate whether the argument is valid or invalid. For valid arguments, prove that

the argument is valid using a truth table. For invalid arguments give truth values for the

variables showing that the argument is not valid.

a)

(p q) r

-------------------

(p q) r

b)

(p q) r

---------------------

(p q) r

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