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Y has been believed to cause Z. A new report, noting that Y [#permalink]
 04 Aug 2008, 11:30
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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.
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Director
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lordw wrote: 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. I would go w/ A.
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lordw wrote: 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. -> says in the absense of Y Z occurs
(B) In cases where X occurs, followed by Y, Y is usually followed by Z. ->weakens
(C) In cases where Y occurs but X does not, Y is usually followed by Z. -> this opposes the suggestion
(D) In cases where Y occurs but Z does not, Y is usually preceded by X. -> thsi is irrelevant
(E) In cases where Z occurs, it is usually preceded by X and Y. -> does not say Y does not cause Z To prove : X not Y causes Z hence (A) is apt for this proof
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Its Now Or Never
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A pour moi
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IMO A
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lordw wrote: 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. IMO A)
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Intern
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we need to prove the situation where X occurs but not Y, followed by Z. Hence A will be correct choice
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Director
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IMO A
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