Dr. Gass
HCOM 235
Spring 2009
=
Identify
each syllogism below as either valid or invalid. If a syllogism is invalid, identi=
fy the
deductive rule that has been violated.
1.
If a person has HIV she or he should never have unprotected sex.
Ricky
never has unprotected sex
Therefore,
Ricky has HIV
2.
No dogs are cats
All
cats are good at catching mice
Therefore,
no dogs are good at catching mice
3.
Every short person is left-handed
Eloise
is left-handed
Therefore,
Eloise is a short person
4.
Nadine told me that if she ever got divorced, she would move to
Nadine
did not move to
Therefore,
Nadine did not get divorced.
5.
All men are human beings
All
women are human beings
Therefore,
all men are women
6.
1 is greater than 2
2
is greater than 3
Therefore,
1 is greater than 3
7.
Italians are great lovers
Joey
is not Italian
Therefore,
Joey is not a great lover
8.
Some men are triathletes
Some
Americans are men
Therefore,
some Americans are triathletes
9.
What’s mine is mine
What’s
yours is mine
Therefore,
what’s mine is yours.
10.
Some Zimzams are Nimtotes=
Some
Nimtotes are Hifhafs
Therefore,
some Zimzams are Hifhafs<=
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11.
All thingamajigs are dealyboppers
No
dealyboppers are whatcham=
ucallits
Therefore,
no thingamajigs are whatchamucallits
12.
No Cathloic favors abortion
Nikki
is not a Cathloic
Therefore,
Nikki favors abortion
=
Other types of ded=
uctive
reasoning (You’ll need to create a grid or “truth table”=
to
solve the problem below).
13. There are three men, each of whom is engaged in a
different occupation. By a strange coincidence their names, Mr. Carpenter,=
Mr.
Mason, and Mr. Painter, are the same as their trades, but not necessarily
respectively.
The following statements were made
about the three men but it turned out that only one statement was t=
rue:
Mr. Carpenter is not a painter.
Mr. Carpenter is a carpenter.
Mr. Mason is not a painter.
Who does what?