Multiple Choice
use indirect truth tables to determine whether each of the following arguments is valid. If the argument is invalid, choose an option which presents a counterexample. (There may be other counterexamples as well.)
-G ⊃ (J • ∼K)
(I ⊃ H) • G
H ⊃ (K I)
J • ∼I / I K
A) Valid
B) Invalid. Counterexample when G, H, I, J, and K are true
C) Invalid. Counterexample when G, H, J, and I are true and K is false
D) Invalid. Counterexample when G, H, and J are true and I and K are false
E) Invalid. Counterexample when G and J are true and H, I, and K are false
Correct Answer:

Verified
Correct Answer:
Verified
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