Question: > Question 7 1 pts A proposition is called a(n) _________ if and only if it is true in all possible worlds. Contradiction Tautology Unification

> Question 7 1 pts A proposition is called a(n) _________

> Question 7 1 pts A proposition is called a(n) _________ if and only if it is true in all possible worlds. Contradiction Tautology Unification Premise Question 8 1 pts are the first set of formulas in a first-order logic argument. Rules Sounds Solutions O Premises

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