Exercise 1.3
Part A: Counterexamples
1. Lewis is a famous author only if he knows how to write. But
Lewis is not a famous author. So, Lewis does not know how to
write.
Your answer of `DA: denying the antecedent' is correct!
3. Rilke is a dreamer if he is
Exercise 6.1A
1. 1. Some works of art are books. 2. All novels are books. So, 3.
Some works of art are novels.
Your answer of `Not standard' is correct!
3. 1. All movies are films. 2. Some documentaries are not movies.
So, 3. Some documentaries are not fi
Exercise 2.1 A
1. Americans are materialistic because they are exposed to more
advertising than any other people on earth.
Your answer of `nonargument (explanation)' is correct!
3. The world fish catch dropped from its 1989 high of 100 million
tons to 97
Exercise 5.1A
1. All hungry cannibals are dangerous people
Your answer of `A' is correct!
Your answer of `Universal' is correct!
Your answer of `Affirmative' is correct!
3. Some diamonds are not valuable objects
Your answer of `O' is correct!
Your answer
Exercise 4.1A
1. To put it bluntly but fairly, anyone today who doubts that the
variety of life on this planet was produced by a process of
evolution is simply ignorant inexcusably ignorant.
Your answer of `Argument against the person' is correct!
3. As I
Exercise 7.4A Problem 1
Correct! Argument is invalid!
Your abbreviated truth table is correct! Row 1 shows that the premises are all
true and the conclusion is false when statement letter A is assigned F, B is
assigned T, and C is assigned F, so you have
Evaluation of your answers from Section 7.1A
The Logic Tutor responds:
1. (A
B C)
Your answer of `Not a WFF' is correct!
2. (~B)
Your answer of `Not a WFF' is correct!
3. (~(C)
F)
Your answer of `Not a WFF' is correct!
4. (E
(~F G)
Your answer of `Not
Exercise 7.3A Problem 1
Argument is valid!
You are correct! The argument is valid. There is no row on which the premises
are all true and the conclusion is false.
Your truth table:
A B | A B, ~A B
-|-T T |
T
F
T
T F |
T
F
F
F T |
T
T
T
F F |
F
T
F
Exercis
Exercise 1.2
Part A: True or False?
1.
3.
5.
7.
9.
11.
13.
15.
17.
19.
21.
23.
25.
27.
29.
True
True
True
False
False
True
True
True
True
True
True
False
True
True
False
Part B: Identify the Forms
1.
A
B
If the solution turns blue litmus paper red, then t
Exercise 1.3
Part A: Counterexamples
1. Denying the antecedent
3. Unnamed invalid form
5. Denying the antecedent
7. Unnamed invalid form
9. Affirming the consequent
11. Denying the antecedent
13. Unnamed valid form
15. Unnamed valid form
17. Unnamed valid