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Multiple choice

Let $C_1$ and $C_2$ are circles defined by $x^2+y^2-20x+64=0$ and $x^2+y^2+30x+44=0$. The length of the shortest line segment PQ that is tangent to $C_1$ at P and to $C_2$ at Q is?

  1. $15$
  2. $18$
  3. $20$
  4. $24$
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