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Logic, Sets and Probability Logic and Truth Table Summary Propositions are represented by p : q : r : etc.
Two propositions can be connected by logic symbols to give a new statement (proposition)
The compound proposition is only false when the first proposition is True and the second False.
Tautology: A statement that is true whatever the truth values of the original propositions.
Contradiction: A statement that is false whatever the truth values of the original propositions.
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