By using truth tables, prove that: a. -(p v q) = ~p ^ ~q b. pv (q ar) = (p V q) ^ (p V r) c. (p → q) = (p ^q) → (q ^ r) d. (p + q) = (p ^ q) V (~p ^~q) e. -(p AqAr) = ~p V ~q V ~r f. ~(p v q V r) = ~p ^ ~q ^ ~r

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