Contraposition requires switching the predicate and subject terms and replacing them with their complements such as happens when “All goats are animals” is contraposed as “All non-animals are non-goats.”

What is the mood and figure of the following categorical syllogism? No insects that eat mosquitos are insects that should be killed. All dragonflies are insects that eat mosquitos. Thus, no dragonflies are insects that should be killed.

If an A proposition is true, then the corresponding E proposition must be false.

Match properly or suffer.

Which is the first rule that is broken in the categorical syllogism below? All cats are mammals. All dogs are mammals. Therefore, all dogs are cats.

A categorical syllogism has three terms: subject term, predicate term, and middle term.

Is the following a VALID syllogism having mood EAO with the major term being things capable of replicating themselves and the minor term being structures that invade cells, and the middle term being viruses.     No viruses are things capable of replicating themselves. All viruses are structures that invade cells. Thus, some structures that invade cells are not things capable of replicating themselves.  

Below is a categorical syllogism. Determine its Figure. No Republicans are Democrats. No Republicans are big spenders. Therefore, all big spenders are Democrats.  

Match correctly for a higher score

The converse of All A are B is All B are A.