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.)
-(H ⊃ ∼I) • ∼J
∼I ⊃ [(J K) • (J H) ]
∼H (K ⊃ L) / L ⊃ ∼H
A) Valid
B) Invalid. Counterexample when H, I, K, and L are true and I is false
C) Invalid. Counterexample when H, I, and L are true and J and K are false
D) Invalid. Counterexample when H, K, and L are true and I and J are false
E) Invalid. Counterexample when H, J, and L are true and I and K are false
Correct Answer:

Verified
Correct Answer:
Verified
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