7 Consider a vocabulary with only four propositions, A, B, C, and D. How many models are...
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7 Consider a vocabulary with only four propositions, A, B, C, and D. How many models are there for the following sentences?
a. B ∨ C.
b. ¬A ∨ ¬B ∨ ¬C ∨ ¬D.
c. (A ⇒ B) ∧ A ∧ ¬B ∧ C ∧ D.
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