“Affirming the Consequent” is the name of an invalid conditional argument form. You can think of it as the invalid version of modus ponens.
1 Answer. Denying the Antecedent is an invalid form.
The invalid argument form known as affirming the consequent has this pattern: If p, then q. q. Therefore, p.. The invalid argument form known as denying the antecedent has this pattern: If p, then q.
A deductive argument that succeeds in providing conclusive support for its conclusion is said to be valid. One that fails to provide conclusive support is said to be invalid.