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Investigators concluded that human failure was not

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Director
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Investigators concluded that human failure was not [#permalink] New post 21 Oct 2004, 07:33
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Investigators concluded that human failure was not responsible for the fatal airplane crash last August, and since that time new and more stringent rules for identifying and reporting mechanical problems have been in effect. That accounts for the fact that reports of airplane mechanical problems have increased in frequency by 50 percent since last August.
Which one of the following is an assumption underlying the argument in the passage?
(A) Airplane travel is still relatively safe, despite the increase in reported mechanical problems.
(B) Mechanical problems in airplanes have increased dramatically since last August.
(C) Mechanical problems in airplanes have not increased by 50 percent since last August.
(D) Airlines are less reluctant to report mechanical problems than they previously were.
(E) Mechanical problems in airplanes have become easier to detect since last August.
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 [#permalink] New post 21 Oct 2004, 08:48
There are two ways number of reported problems can rise

1 - reporting has not changed but no of problems have increased
2 - number of problems were same but because of stringent regulations the number of previously unreported problmes are reported now.

Since the argument links increase in no of reported problems to increase in regulations, then first assumption should be ruledout.

choice (C) negates the first assumption I mentioned.
If (C) is negated then first above mentioned assumption becomes true and the argument breaks down.
  [#permalink] 21 Oct 2004, 08:48
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Investigators concluded that human failure was not

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