medium · LSAT Logical Reasoning

Consider the rule: 'The alarm sounds only if the sensor detects motion.'

Which one of the following is the correct translation of this rule into conditional form?

  1. If the alarm sounds, then the sensor must have detected motion.
  2. If the sensor detects motion, then the alarm must sound.
  3. Either the alarm sounds or the sensor detects motion.
  4. If the alarm does not sound, then the sensor did not detect motion.
  5. If the sensor does not detect motion, then the alarm may or may not sound.

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