Some guitars are electronic devices. Therefore, some guitars are not electronic devices.

Question

Quizplus · Accepted Answer

This statement is invalid because it presents a contradictory statement. If some guitars are electronic devices (which is true), then it is impossible for some guitars to not be electronic devices (which is what the second part of the statement implies). This is an example of an illicit subcontrary, which is a type of fallacy in which two contradictory statements are presented as true.

Some Guitars Are Electronic Devices