狒狒逻辑求解

Susan118628 · 发表于 2011-5-21 22:40:03

23. On a certain day, nine scheduled flights on Swift Airlines were canceled. Ordinarily, a cancellation is due to mechanical problems with the airplane scheduled for a certain flight. However, since it is unlikely that Swift would have the mechanical problems with more than one or two scheduled flights on a single day, some of the nine cancellations were probably due to something else.
The argument depends on which one of the following assumptions?
(A) More than one or two airplanes were scheduled for the nine canceled flights.
(B) Swift Airlines has fewer mechanical problems than do other airlines of the same size.
(C) Each of the canceled flights would have been longer than the average flight on Swift Airlines.
(D) Swift Airlines had never before canceled more than one or two scheduled flights on a single day.
(E) All of the airplanes scheduled for the canceled flights are based at the same airport.

不懂，为什么答案是A？

sdcar2010 · 发表于 2011-5-22 05:15:43

For necessary assumption, use negation method.

The stimulus says that "it is unlikely that Swift would have the mechanical problems with more than one or two scheduled flights on a single day," the cancellation is caused by something else.

If you negate A, you get ""NO more than one or two airplanes were sheduled for the nine canceled filights." If this is true, then it is likely the cancellation is caused by nothing but mechanical prolbems with the one or two airplanes for the 9 flights. Thus the argument falls apart.

A is the correct answer.

Susan118628 · 发表于 2011-5-23 23:22:29

thanks！！！

狒狒逻辑求解

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