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Multiple choice

Find the length of direct common tangent of circle $(x-1)^{ 2 }+(y-2)^{ 2 }=4$ and $(x-5)^{ 2 }+(y-2)^{ 2 }=1$

  1. $\sqrt { 17 } $
  2. $\sqrt { 15 } $
  3. $\sqrt { 5 } $
  4. $\sqrt { 7 } $
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