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Determine whether the following formulas are valid (tautologies) or not, using the mcthod of semantic tableaux: (a) ((p q) q) q (b) ((p q)

 

Determine whether the following formulas are valid (tautologies) or not, using the mcthod of semantic tableaux: (a) ((p q) q) q (b) ((p q) p) p (c) (pAq) (p V r) (d) (pV(q A r)) ((p ++ r) V q)

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