Multiple Choice
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.
Correct Answer:

Verified
Correct Answer:
Verified
Q266: None but students are eligible.<br>A) All students
Q267: Not every concert pianist is famous.<br>A) Some
Q268: No sugar plum fairies are threatening beasts.
Q269: Some S are not P. (Boolean standpoint)
Q270: All A are non-B. (F) Contrary<br>A) Some
Q272: Some A are non-B. (T) All A
Q273: All A are non-B. (F) Conversion<br>A) All
Q274: Given the categorical proposition "No soccer balls
Q275: No talented actors are unpopular performers. Therefore,
Q276: An eagle circled overhead.<br>A) Some eagles are