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# Y has been believed to cause Z. A new report, noting that Y

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Director
Joined: 12 Oct 2008
Posts: 545
Y has been believed to cause Z. A new report, noting that Y [#permalink]

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18 Jan 2009, 12:51
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Y has been believed to cause Z. A new report, noting that Y and Z are often observed to be preceded by X, suggests that X, not Y, may be the cause of Z.

Which of the following further observations would best support the new report's suggestion?

(A) In cases where X occurs but Y does not, X is usually followed by Z.
(B) In cases where X occurs, followed by Y, Y is usually followed by Z.
(C) In cases where Y occurs but X does not, Y is usually followed by Z.
(D) In cases where Y occurs but Z does not, Y is usually preceded by X.
(E) In cases where Z occurs, it is usually preceded by X and Y.

A
Manager
Joined: 17 Dec 2008
Posts: 173

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18 Jan 2009, 12:57
Need to prove that X=>Z and not Y.
Only A meets the criteria.
Manager
Joined: 24 Sep 2008
Posts: 103

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18 Jan 2009, 14:36
(B)
_________________

Kick GMAT ass

Director
Joined: 12 Oct 2008
Posts: 545

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18 Jan 2009, 22:50
OA A
Intern
Joined: 07 Feb 2006
Posts: 25

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18 Jan 2009, 23:00
Conclusion: X not Y may be the cause of Z.
The statement which supports the conclusion should surely involve X & Z. So, I cross out C and D.
B & E don’t support the conclusion. I will go with A.
Director
Joined: 01 Aug 2008
Posts: 732

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19 Jan 2009, 11:27
A...
Re: CR: XYZ Logic   [#permalink] 19 Jan 2009, 11:27
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