PHILOSOPHICAL PERSPECTIVES

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EXERCISES FOR PART THREE

I. What is wrong with the following statements?

1. Validity is when an argument is true; i.e., its premises are true and its conclusion is true.

2. An argument is valid when it is both sound and true.

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3. Premises can be true or false; conclusions are sound or unsound.

4. An argument’s validity depends on the truth of its premises.

5. An argument’s soundness depends upon its form.

II. Determine whether the following statements are true or false, and why.

1. A valid argument can have false premises.

2. A sound argument can have a false conclusion.

3. If an argument is sound, then it must be valid.

4. All valid arguments are also sound arguments.

5. All sound arguments are also valid arguments.

6. If an argument has all true premises and a true conclusion, then it is sound.

7. A valid argument must have a true conclusion.

8. It is correct to say that an argument is true or false.

9. An invalid argument must have at least one false premise.

10. An invalid argument must have a false conclusion.

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