Question: 13. [U (T S)] [(T U) (S U)] Use truth tables to determine whether the following symbolized statements are

★13. [U • (T ∨ S)] ≡ [(∼T ∨ ∼U) • (∼S ∨ ∼U)] Use truth tables to determine whether the following symbolized statements are tautologous, self-contradictory, or contingent.

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