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Argumentation And Advocacy (COM-362) T7 Reading Exercises - Final

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Grand Canyon University

Argumentation and Advocacy (COM-362)

Topic 7 Reading Exercises from:
Copi, Irving M. Introduction to Logic, 14th Edition. Routledge.
7.2 INSTRUCTIONS
Translate the following syllogistic arguments into standard form, and test their validity by using
the syllogistic rules set forth in Chapter 6.
Example Problem
Some preachers are persons of unfailing vigor. No preachers are nonintellectuals. Therefore
some intellectuals are persons of unfailing vigor.
Example Solution
This argument may be translated into: Some preachers are persons of unfailing vigor. (Some P is
V.) All preachers are intellectuals. (By obversion: All P is I.) Therefore some intellectuals are
persons of unfailing vigor. (Some I is V.) Explain whether the syllogism is valid using the 6 rules
(6.4) and mood (6.5).
PROBLEMS
2. Some metals are rare and costly substances, but no welder’s materials are nonmetals; hence
some welder’s materials are rare and costly substances.
Some metals are rare and costly substances
All welder’s materials are metals
Therefor some welder’s materials are rare and costly substances
IAI-invalid-rule 2 undistributed in the middle
3. Some Asian nations were nonbelligerents, because all belligerents were allies either of
Germany or Britain, and some Asian nations were not allies of either Germany or Britain.
All belligerents were allies either of Germany or Britain
Some Asian nations were not allying of either Germany or Britain
Therefore, Asian nations were nonbelligerent
AOO-2-Valid
4. Some nondrinkers are athletes, because no drinkers are persons in perfect physical condition,
and some people in perfect physical condition are not nonathletes.
No
Some nondrinkers are athletes
Therefor some people in perfect physical condition are athletes
EIO4-Valid
5. All things inflammable are unsafe things, so all things that are safe are nonexplosives, because
all explosives are flammable things.

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Argumentation And Advocacy (COM-362) T7 Reading Exercises - Final

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