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Select a Counterexample for the Given Invalid Argument \lor

Question 156

Multiple Choice

select a counterexample for the given invalid argument.
-1. (∀x) [Tx ⊃ (∼Wx \lor Fx) ]
2) (∀x) [(∼Wx • Tx) ⊃ ∼Fx]
3) (∃x) (Tx • Fx) / (∃x) (Tx • ∼Wx)


A) Counterexample in a domain of 1 member, in which: Ta: True Wa: False Fa: True
B) Counterexample in a domain of 1 member, in which: Ta: True Wa: True Fa: True
C) Counterexample in a domain of 1 member, in which: Ta: False Wa: True Fa: True
D) Counterexample in a domain of 1 member, in which: Ta: True Wa: True Fa: False
E) Counterexample in a domain of 1 member, in which: Ta: False Wa: True Fa: False

Correct Answer:

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