No expensive lawsuits are friendly exchanges. Therefore, no unfriendly exchanges are inexpensive lawsuits.
A) Invalid, illicit subalternation.
B) Valid, no fallacy.
C) Invalid, illicit conversion.
D) Invalid, illicit obversion.
E) Invalid, illicit contraposition.

Question

Quizplus · Accepted Answer

The argument commits the fallacy of illicit contraposition. Illicit contraposition involves incorrectly inferring that because all members of one category are not members of another category, all members of the negation of the second category are not members of the negation of the first category. The original statement does not logically imply the conclusion because it improperly flips and negates both subjects and predicates.

No Expensive Lawsuits Are Friendly Exchanges