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Question

Consider a vocabulary with only four propositions A, B, C and D. How many models are there for the following sentence?

¬A ∨ ¬B ∨ ¬C ∨ ¬D

a.

7

b.

8

c.

15

d.

16

Answer: (c).15

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Q. Consider a vocabulary with only four propositions A, B, C and D. How many models are there for the following sentence? ¬A ∨ ¬B ∨ ¬C ∨ ¬D

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