It is false that some cases of genocide are not attacks on humanity. Therefore, it is false that no cases of genocide are attacks on humanity.
A) Invalid, illicit contrary.
B) Invalid, illicit subcontrary.
C) Invalid, illicit subalternation.
D) Valid.
E) Invalid, illicit conversion.

Question

Quizplus · Accepted Answer

The argument is valid because it follows the valid form of contrapositive. If some cases of genocide are attacks on humanity (P), then it must be true that no cases of genocide are not attacks on humanity (Q). The contrapositive of this statement is "If some cases of genocide are not attacks on humanity (~Q), then it must be false that no cases of genocide are attacks on humanity (~P)". Thus, the original statement "It is false that some cases of genocide are not attacks on humanity" is equivalent to the statement "No cases of genocide are not attacks on humanity."

It Is False That Some Cases of Genocide Are Not