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Multiple choice

The length of the common chord of circles $x^2 + y^2 - 6x - 16 = 0 $ and $x^2 + y^2 - 8y - 9 = 0 $ is -

  1. $ 10 \sqrt3 $
  2. $ 5 \sqrt3 $
  3. $ \dfrac {5 \sqrt3}{2} $
  4. None of these

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