1. The negation of a tautology is a contradiction.
    1.   True
    2.   False
  2. The negation of a contradiction is sometimes a contingency.
    1.   True
    2.   False
  3. The negation of a contingency is a tautology.
    1.   True
    2.   False
  4. The negation of a tautology is a contingency.
    1.   True
    2.   False
  5. The conjunction of two tautologies is itself a tautology.
    1.   True
    2.   False
  6. The conjunction of two contradictions is a tautology.
    1.   True
    2.   False
  7. The conjunction of two contingencies always produces another contingency.
    1.   True
    2.   False
  8. The conjunction of a tautology and a contingency produces a contingency.
    1.   True
    2.   False
  9. The conjunction of a tautology and a contradiction is a contingency.
    1.   True
    2.   False
  10. The disjunction of two tautologies is itself a tautology.
    1.   True
    2.   False
  11. The disjunction of two contingencies might be a tautology.
    1.   True
    2.   False
  12. The disjunction of a tautology and a contradiction is a contingency.
    1.   True
    2.   False
  13. The disjunction of two contradictions is a tautology.
    1.   True
    2.   False
  14. A conditional which has a tautology for its consequent is itself a tautology.
    1.   True
    2.   False
  15. A conditional which has a contradiction for its consequent is itself a contradiction.
    1.   True
    2.   False
  16. A conditional which has a contradiction for an antecedent is always true.
    1.   True
    2.   False
  17. A conditional which has a contingency for its antecedent is sometimes a contradiction.
    1.   True
    2.   False
  18. A conditional which has a contingency for its consequent is sometimes a contradiction.
    1.   True
    2.   False
  19. A conditional which has a contingency for its consequent is sometimes a tautology.
    1.   True
    2.   False
  20. A biconditional that has a tautology on the left and another tautology on the right would be a tautology itself.
    1.   True
    2.   False
  21. A biconditional that has a contradiction on the left and another contradiction on the right would be a contradiction itself.
    1.   True
    2.   False
  22. A biconditional that has a contradiction on the left and a tautology on the right would be a contingency.
    1.   True
    2.   False
  23. A biconditional that has a contingency on the left and another contingency on the right might be a contradiction.
    1.   True
    2.   False
  24. A biconditional that has a contingency on the left and another contingency on the right might be a tautology.
    1.   True
    2.   False
  25. An argument whose conclusion is a tautology must be valid.
    1.   True
    2.   False
  26. An argument whose conclusion is a contradiction must be invalid.
    1.   True
    2.   False
  27. An argument one of whose premises is a tautology must be valid.
    1.   True
    2.   False
  28. An argument one of whose premises is a contradiction must be valid.
    1.   True
    2.   False
  29. An argument all of whose premises are tautologies must be valid.
    1.   True
    2.   False
  30. An argument all of whose premises are tautologies must be invalid.
    1.   True
    2.   False