Basic Concepts
The starred items are also contained in the Answer Key in the back of The Power of
Logic.
Exercise 1.1
Part A: Recognizing Statements
*1. Statement
2. Sentence only
3. Sentence only
*4. Statement
5. Statement
6. Statement
*7. Neither
8. Statement
9. Neither
*10. Statement
11. Statement
12. Sentence only
*13. Statement
14. Sentence only
15. Sentence only
,*16. Sentence only
17. Statement
18. Neither
*19. Statement
20. Neither
21. Neither
22. Neither
23. Neither
24. Sentence only
25. Sentence only
26. Neither
27. Sentence only
28. Statement
29. Neither
30. Statement
Part B: True or False?
*1. False
2. True
3. False
*4. True
5. False
6. False
*7. False
8. True
, 9. True
*10. False
11. False
12. True
*13. True
14. False
15. True
*16. False
17. False
18. False
*19. True
20. True
21. False
*22. False
23. False
24. True
*25. False
26. False
27. True
*28. True
29. True
30. False
31. False
32. False
33. True
, 34. False
35. False
Part C: Valid or Invalid?
*1. Valid
2. Invalid
3. Invalid
*4. Valid
5. Valid
6. Valid
*7. Invalid
8. Valid
9. Invalid
*10. Invalid
11. Invalid
12. Valid
*13. Invalid
14. Valid
15. Valid
Part D: Soundness
*1. Sound
2. Sound
3. Unsound, because invalid; also, conclusion obviously false
*4. Unsound; the argument is invalid.
5. Sound