Civil Service Exam Reviewer · Logical Reasoning · easy

Consider the statement: "If the river reaches the critical level, then the residents are evacuated." Suppose it is true that the river reaches the critical level. Which conclusion necessarily follows?

  1. The residents are not evacuated.
  2. The river does not reach the critical level.
  3. No definite conclusion can be drawn.
  4. The residents are evacuated.

Answer

D. The residents are evacuated.

Solution

The statement says that whenever the river reaches the critical level, the residents are evacuated. Since the river reaches the critical level, it follows that the residents are evacuated. (This is modus ponens.)

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