Categorical Syllogisms "LOGIC"?

Question

Identify the rule that is broken by any of the following syllogisms that are invalid, and name the fallacy that they commit.

Some diamonds are not precious stones.

Some carbon compounds are not diamonds.

Therefore some carbon compounds are not precious stones.

Answer 1

The form of this syllogism is OOO-1.

This syllogism commits the fallacy of exclusive premises. The rules state that two negative premises are not allowed. Syllogisms that break this rule commit the fallacy of exclusive premises.