Propositional Logic: Logical Arguments and Informal Fallacies

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Multiple Choice

Which of the following is a valid logical argument?

  1. If it is raining, then the ground is wet. It is raining. Therefore, the ground is wet.
  2. All dogs are mammals. All mammals are animals. Therefore, all dogs are animals.
  3. Some birds can fly. Penguins are birds. Therefore, penguins can fly.
  4. No cats are dogs. All dogs are animals. Therefore, no cats are animals.
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