Not Q.
Therefore, not P.
If and only if P, then Q.
Not P.
Therefore, not Q.
If P, then Q.
Not P.
Therefore, not Q.
5 points
Question 16
1.
The syllogism itself, not the premises, can be _____.
Answer
 A
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valid.
true.
false.
all of the above.
5 points
Question 17
1.
A syllogism in which one of the premises is missing is called a(n) _________________.
Answer
 B
soft deductive argument.
analogical argument.
sentential argument.
enthymeme.
5 points
Question 18
1.
Complete the following syllogism: All X are Y; Some Z are X; Therefore, ______________.
Answer
 A
some Z are Y.
some X are Z.
all X are Z.
all Z are Y.
5 points
Question 19
1.
Which one of the following syllogisms is invalid?
Answer
 C
No X are Y.
Some Z are X.
Therefore, some Z are not Y.
Some X are Z.
All X are Y.
Therefore, some Y are Z.
Some X are Y.
Some Z are X.
Therefore, some Z are Y.
Some X are not Z.
All X are Y.
Therefore, some Y are not Z.
5 points
Question 20
1.
In a valid syllogism, if the first two premises are true, then ______________.
Answer
 D
the conclusion must be true.
the conclusion must be false.
the conclusion could be either true or false.
the conclusion must be valid.
Reference
web.cn.edu/kwheeler/documents/
Syllogisms
.pdf
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 Summer '09
 dh
 Logic, Syllogism

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