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First-Order Predicate Logic

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Multiple Choice

Which of the following is a valid syntax for a first-order predicate logic statement?

  1. ∀x(Px → Qx)
  2. ∃x(Px ∧ Qx)
  3. (Px ∨ Qx) → ∀x(Px ∨ Qx)
  4. None of the above
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