Question: Q 4. Using truth tables, determine whether the following propositions are tautology, con- tingency, or contradiction: (a) -( 9) + P (b) (pA(- -)) (c)

Q 4. Using truth tables, determine whether the following propositions are tautology, con- tingency, or contradiction: (a) -( 9) + P (b) (pA(- -)) (c) (p Vr) A(-V-p) Vr I (d) ((p Vr) (q V r) ((PA) V-r)

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