Let P: "elephants can fly" and Q: "horses can dance". Then "if elephants can fly, then horses can dance" is best represented by: a) P ? Q b) P ? Q c) P ? Q d) None of these < a formula > is a ________ a) Tautology b) Contradiction c) An atomic proposition d) None of the mentioned What can we correctly say about formula P1: P1 = p ? (p ? q) a) P1 is tautology b) P1 is a contradiction c) If p is true and q is false and r is false, then P1 is false d) If p as true and q is true and r is false, then P1 is false In propositional logic, which of the following is equivalent to P ? Q? a) P ? Q b) ¬P ? Q c) P ? ¬Q d) None of these
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