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phiosophy journal

Help me study for my Philosophy class. I’m stuck and don’t understand.

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For this journal assignment, determine if each of following arguments validity (valid or invalid) and soundness (sound or unsound). In addition, explain WHY each argument is valid or invalid, sound or unsound. Here is an example:

1. No mammals are birds. Some penguins are mammals. Therefore, some penguins are not birds.

This argument is valid, because the form, if all premises are true, guarantees that the conclusion is also true. However, this argument is unsound, because one of the premises (some penguins are mammals) is not true.

Each question below will be worth two points each; one point if you correctly identify the validity/soundness, and one point if you correctly explain why. Partial credit will be given only one of the two criteria is correctly identified.

Questions

  1. Some twins are sisters. All twins are siblings. Therefore, some siblings are sisters.
  2. All students are dormitory residents. No dormitory residents are birds. Therefore, no birds are students.
  3. All millionaires are rich people. Some Australians are not rich people. Therefore, some Australians are not millionaires.
  4. No spider monkeys are elephants. All elephants are animals. Therefore, no spider monkeys are animals.
  5. Some tacos have cheese. Some tacos have lettuce. Therefore, some tacos are burritos.

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