Some mules are donkeys. Some mules are horses. Hence, some donkeys are horses.
A) Valid and sound
B) Valid and unsound
C) Invalid

Question

Quizplus · Accepted Answer

This is an invalid syllogism. The premise that "some mules are horses" does not lead to the conclusion that "some donkeys are horses." It is possible for there to be mules that are not related to either donkeys or horses, so the conclusion cannot be drawn.

Some Mules Are Donkeys