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Since 1978 when the copyright law was changed, books that

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Since 1978 when the copyright law was changed, books that [#permalink] New post 05 Oct 2004, 19:32
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7. Since 1978 when the copyright law was changed, books that are less than 50 years old must not be photocopied without the publisher's permission. Thus, any book that has been photocopied since 1978 without the publisher's permission must be at least fifty years old.

The reasoning above exhibits a flaw similar to one in which of the following?
a) Any member of the solar system must be either a planet or a moon, so if an asteroid is neither a planet nor a moon, it must not be a member of the solar system.
b) Anyone who rides a city bus must buy a bus pass, and since Demetios has a bus pass, he must be riding on a city bus.
c) A driver who turns right must signal, so any driver who did not signal must not have turned right.
d) Anyone who legally crosses a national boundary must have a passport: thus anyone who does not have a passport cannot legally cross a national boundary.
e) Any wage earner residing in the state must pay state tax, so since Boldwin pays state taxes, she must be resident in the state
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 [#permalink] New post 05 Oct 2004, 19:42
C.

books<50 => Should not be copied
If copied => books>50

Similarly,
Driver turns right =>Should signal
If not signalled => must not turn right.

D comes close but has "cannot"
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 [#permalink] New post 05 Oct 2004, 20:05
I'd go with A
Argument has following form:
If X, then not Y. Since Y, then not X
Only A follows that
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Re: CR: copyright law [#permalink] New post 05 Oct 2004, 20:12
kok72 wrote:
7. Since 1978 when the copyright law was changed, books that are less than 50 years old must not be photocopied without the publisher's permission. Thus, any book that has been photocopied since 1978 without the publisher's permission must be at least fifty years old.

The reasoning above exhibits a flaw similar to one in which of the following?
a) Any member of the solar system must be either a planet or a moon, so if an asteroid is neither a planet nor a moon, it must not be a member of the solar system.
b) Anyone who rides a city bus must buy a bus pass, and since Demetios has a bus pass, he must be riding on a city bus.
c) A driver who turns right must signal, so any driver who did not signal must not have turned right.
d) Anyone who legally crosses a national boundary must have a passport: thus anyone who does not have a passport cannot legally cross a national boundary.
e) Any wage earner residing in the state must pay state tax, so since Boldwin pays state taxes, she must be resident in the state


I would also go with C for the following reasons. The flaw in the original argument is the assumptions no body will illegally make photocopies. But it is possible that people might have copied the book illegally without seeking permission.

C follows the same analogy here, assuming that no car will mistakenly turn a right turn without a signal. Some cars can make a right turn without signallling.
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 [#permalink] New post 06 Oct 2004, 01:46
My pick is B.
If book is 50 or more (X) -> Then photocopy it(Y)
If book has been photocopied (Y) -> Book is > 50 years old (not X) which is the flaw in the reasoning

Only B clearly establishes this flaw. E also comes close
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 [#permalink] New post 06 Oct 2004, 07:27
I will go with C.

I think A is close but I dont find it parallel to the stem.

Books > 50 years cannot b photocopied without permission
Book photocopied without permission then book is > 50 years

Driver signals then he turns right
'Driver does not turn right so he did not signal' is 'nt this parallel to
'U photocopied the book so its 50 years old'????

Guys can you comment on my reasoning.......
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 [#permalink] New post 06 Oct 2004, 07:32
C

reasoning same as hardworker_indian's
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Re: CR: copyright law [#permalink] New post 06 Oct 2004, 07:35
Since 1978 when the copyright law was changed, books that are less than 50 years old must not be photocopied without the publisher's permission. Thus, any book that has been photocopied since 1978 without the publisher's permission must be at least fifty years old.

The reasoning above exhibits a flaw similar to one in which of the following?

Original argument has structure
If A(book less than 50 years old)-> then B (not photocopied)
not B (photocopied)-> not A (at least 50 yeas old)

a) Any member of the solar system must be either a planet or a moon, so if an asteroid is neither a planet nor a moon, it must not be a member of the solar system.

Obviously not. It has conditions either.. or..
b) Anyone who rides a city bus must buy a bus pass, and since Demetios has a bus pass, he must be riding on a city bus.
If A(rides on bus) then B (has bus pass)
If B then A fallasious and has different structure

c) A driver who turns right must signal, so any driver who did not signal must not have turned right.
If A (turn right) then B (must signal)
Not B (didn't signal) not A (not turn right)
BINGO! the same structure and no fallacy!
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 [#permalink] New post 06 Oct 2004, 07:48
I'd go with A, but whats the answer given?
Also, whats the source of this problem?
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 [#permalink] New post 06 Oct 2004, 18:42
OA is C.
Source? It is from my GMAT class.
Probably it is from GMAT PT or LSAT PT.

In fact, both A and C have the same logic, but there is something different.

The logic of B and E is:
A => B, therefore, B => A.
This logic is different from original one.
  [#permalink] 06 Oct 2004, 18:42
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