1. Unit II LOGICSection 3.7: Argument and Truth Tables

2. What is an argument??? An argument consists of TWO parts! Premises given statements Conclusion decision reached

3. True or not…that is the QUESTION! Valid Argument : If premises are true, the conclusion is true Invalid Argument (fallacy): argument that isn’t true

4. Testing the Validity of a Statement Use TRUTH TABLES!!! An argument is valid if the statement is a tautology (basically the last column of the truth table is true)

5. Types of Valid Arguments

6. Types of Invalid Arguments

7. Example : 1.

8. SOLUTION Example : 1. Fallacy of inverse invalid Solution using TRUTH TABLE:

9. SOLUTION Example : 1. Fallacy of inverse invalid Solution using TRUTH TABLE:

10. SOLUTION Example : 1. Fallacy of inverse invalid Solution using TRUTH TABLE:

11. SOLUTION Example : 1. Fallacy of inverse invalid Solution using TRUTH TABLE:

12. SOLUTION Example : 1. Fallacy of inverse invalid Solution using TRUTH TABLE: Since the second row of the last column is FALSE, the statement is a fallacy, or INVALID