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Assertion: Radar is used to detect an aeroplane in the sky.

Reason: Radar works on the principle of reflection of waves.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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