When the subject and predicate of both the propositions are the same but they differ in quality as well as quantity, it is known as:

When two propositions share subject and predicate but differ in both quality and quantity, they are contradictories.

Quality is the difference between affirmation and negation.

Quantity is the difference between universal and particular.

A universal affirmative and a particular negative differ on both counts.

Such a pair, a universal affirmative and a particular negative, can never share the same truth value.

Opposition differing in quality and quantity together defines contradictories.