3. Use the short truth table method to determine the validity or invalidity of all the argu- ment forms above, as well as the following, which contain more variables. (Here premises and conclusion are listed horizontally.) b. ~(p•q) Ɔ ~(r v s), (~p = (t v w)), ((r•w) = z) / .. (z Ɔ ~ s) d. (pvq) (r vs), p = ~(r•t), s=t/.. pɔt

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