Given the following sorites: Some G are A.
No G are K.
All N are K.
All F are N.

No F are A.
This sorites is:
A) Invalid because one of the middle terms is undistributed.
B) Invalid because a term is distributed in the conclusion but not in the premise.
C) Invalid because the conclusion in negative but three premises are affirmative.
D) Valid because no rules are broken.
E) Valid because a negative premise requires a negative conclusion.

Question

Given the following sorites: Some G are A.
No G are K.
All N are K.
All F are N.

No F are A.
This sorites is:
A) Invalid because one of the middle terms is undistributed. 
B) Invalid because a term is distributed in the conclusion but not in the premise. 
C) Invalid because the conclusion in negative but three premises are affirmative. 
D) Valid because no rules are broken. 
E) Valid because a negative premise requires a negative conclusion.

Quizplus · Accepted Answer

The term "N" is distributed in the conclusion ("All N are K"), but it is not distributed in any of the premises. This makes the syllogism invalid.

Given the Following Sorites: Some G Are A