28. It is false that no high schools are institutions plagued by drunkenness. Therefore, it is false that some high schools are
not institutions plagued by drunkenness.
a. Invalid, illicit subalternation.
b. Invalid, illicit subcontrary.
c. Invalid, illicit contrary.
d. Invalid, illicit conversion.
e. Valid.
29. No sugar plum fairies are threatening beasts. Therefore, some sugar plum fairies are not threatening beasts.
a. Valid.
b. Invalid, existential fallacy.
c. Invalid, illicit subalternation.
d. Invalid, illicit subcontrary.
e. Invalid, illicit contrary.
30. No arms manufacturers are contributors to world peace. Therefore, no contributors to world peace are arms
manufacturers.
a. Invalid, illicit contrary.
b. Invalid, illicit conversion.
c. Invalid, illicit contraposition.
d. Invalid, illicit obversion.
e. Valid.
31. It is false that no student loans are heavy financial burdens. Therefore, all student loans are heavy financial burdens.
a. Valid.
b. Invalid, existential fallacy.
c. Invalid, illicit subcontrary.
d. Invalid, illicit contrary.
e. Invalid, illicit subalternation.
32. It is false that some flu shots are guarantees of immunity. Therefore, some flu shots are not guarantees of immunity.
a. Invalid, illicit contrary.
b. Invalid, illicit subalternation.
c. Valid.
d. Invalid, illicit subcontrary.
e. Invalid, illicit contraposition.
33. All fair elections are elections untainted with fraud. Therefore, all elections tainted with fraud are unfair elections.
a. Valid.
b. Invalid, illicit conversion.
c. Invalid, existential fallacy.
d. Invalid, illicit obversion.
e. Invalid, illicit contraposition.