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Mathematical Proof

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Multiple Choice

Which of the following is a valid deductive argument?

  1. All dogs are mammals. My pet is a dog. Therefore, my pet is a mammal.
  2. All fruits contain sugar. Apples are fruits. Therefore, apples contain sugar.
  3. All cats are carnivores. My pet is a cat. Therefore, my pet is a herbivore.
  4. All birds have wings. Penguins are birds. Therefore, penguins can fly.
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