It is false that some square triangles are cubes. Therefore, no square triangles are cubes.
A) Invalid; illicit subalternation.
B) Invalid; existential fallacy.
C) Invalid; illicit contradiction.
D) Valid; no fallacy.
E) Invalid; illicit conversion.

Question

Quizplus · Accepted Answer

The argument is logically valid as it follows the rule of contrapositive. If some square triangles are not cubes, then we can conclude that no square triangles are cubes. There is no fallacy in the argument.

It Is False That Some Square Triangles Are Cubes