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Question: 241 explain what the three dichotomies of modality are and...

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[24-1]   Explain what the three dichotomies of modality are; and
               Explain why there are discordance as well as harmony
               among them.


      [24-2]   Determine which of the following sentences are
               tautologies, which are contradictions, and which are
               contingent.

               Show your results in Truth Tables.

               (extracted from textbook exercise 3-6)

1.   ~(A & ~A)

2.   A V (A -> B)

3.   A <-> (B v ~ B)

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