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medium · LSAT Logical Reasoning

Either the outage was caused by a power surge or by a cut cable. Investigators determined it was not caused by a power surge. Therefore, it was caused by a cut cable.

The pattern of reasoning in the argument above is most closely paralleled in which one of the following?

  1. Either the recipe calls for butter or for oil. It calls for butter. Therefore, it does not call for oil.
  2. Either the error is in the formula or in the data entry. Analysts found it is not in the formula. Therefore, it is in the data entry.
  3. Either the key is in the drawer or in the safe. It is not in the drawer. Therefore, it is not in the safe.
  4. If the fault was not a power surge, it was a cut cable. The fault was not a power surge. Therefore, it was a cut cable.
  5. Either the leak is at the valve or at the seal. It is not at the valve, and it is not at the seal. Therefore, there is no leak, because the valve and seal are treated as an exhaustive list of possible leak locations.

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