Formal Logic Questions
Tom will go to the movies only when his wife is out of town. He'll go to a matinee alone, but will see a movie at night only if accompanied, by Cruise and Katie.
This simple stimulus is made up of a couple of formal logic statements, each fraught with its own implications. Be on the lookout for Logical Reasoning stimuli that contain sentences that can be boiled down to such hard and fast rules. When you come across examples of these, you can apply the following principles of formal logic to help you arrive at the correct answer.
The Contrapositive
For any if/then statement - or a statement that can be translated into if/then form - the contrapositive of the statement will result in an equally valid second statement.
The contrapositive can be formed by reversing and negating the terms of any if/then statement. The general model goes like this:
If X, then Y.
The contrapositive of this statement is;
If not Y, then not X.
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