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# A theory is either true or false. Galileo's observations of

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Manager
Joined: 28 Jul 2009
Posts: 152
A theory is either true or false. Galileo's observations of [#permalink]

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01 Dec 2009, 11:05
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54% (02:46) correct 46% (01:49) wrong based on 103 sessions

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A theory is either true or false. Galileo's observations of Jupiter's satellites that the Ptolemaic theory of the motion of celestial bodies is false. Therefore, since the Copernican theory of planetary motion is inconsistent with the Ptolemaic account, Galileo's observations of Jupiter's satellites proved the truth of the Copernican theory.

The argument above is open to the objection that it makes the questionable assumption that

(A) whoever first observed something inconsistent with the truth of the Ptolemaic theory should be credited with having proved that theory false
(B) there are some possible observations that would be inconsistent with the account given by the Copernican theory but consistent with the account given by the Ptolemaic theory
(C) the Ptolemaic and Copernican theories, being inconsistent, cannot both be based on exactly the same evidence
(D) numerous counterexamples were necessary in order to show the Ptolemaic theory to be false
(E) the Ptolemaic and Copernican theories, being inconsistent, cannot both be false
Manager
Joined: 17 Aug 2009
Posts: 226
Re: a theory is either true or false [#permalink]

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01 Dec 2009, 11:51
E for me

Whats the OA?
Manager
Joined: 19 Jul 2009
Posts: 53
Schools: McIntire, Fuqua, Villanova, Vandy, WashingtonU
Re: a theory is either true or false [#permalink]

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01 Dec 2009, 13:51
Looks like E to me

(e) => One of theories has to be right
Stimulus => One of theories is wrong, hence the other one is right
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Manager
Joined: 29 Jul 2009
Posts: 218
Re: a theory is either true or false [#permalink]

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01 Dec 2009, 14:47
E pretty easy. Just bc Copernicus's theory is inconsistent with Ptolemy's doesn't mean it's true.
Manager
Joined: 01 Oct 2010
Posts: 120
Re: a theory is either true or false [#permalink]

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09 Feb 2011, 05:42
OA is E.

http://www.beatthegmat.com/theory-is-ei ... hington-DC
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Manager
Joined: 23 Nov 2009
Posts: 89
Schools: Wharton..:)
Re: a theory is either true or false [#permalink]

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09 Feb 2011, 12:36
use assumption negation that works..ans is E!
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Manager
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Posts: 183
Re: a theory is either true or false [#permalink]

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09 Feb 2011, 13:14
E
Manager
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Re: a theory is either true or false [#permalink]

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10 Feb 2011, 21:08
+1 for E,,
Manager
Joined: 19 Feb 2009
Posts: 55
Re: a theory is either true or false [#permalink]

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15 Feb 2011, 07:32
E for me too
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Re: A theory is either true or false. Galileo's observations of [#permalink]

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02 Aug 2014, 00:15
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: A theory is either true or false. Galileo's observations of   [#permalink] 02 Aug 2014, 00:15
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