It is false that no exercise machines are cumbersome devices. Therefore, all exercise machines are cumbersome devices.
A) Invalid, existential fallacy.
B) Invalid, illicit contrary.
C) Invalid, illicit contraposition.
D) Invalid, illicit subcontrary.
E) Invalid, illicit subalternation.

Question

Quizplus · Accepted Answer

The argument commits the fallacy of illicit contrary, which asserts that since it is false that no exercise machines are cumbersome devices, then it must be true that all exercise machines are cumbersome devices. This is not a valid reasoning since there may be some exercise machines that are not cumbersome.

It Is False That No Exercise Machines Are Cumbersome Devices