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In a triangle $\text{PQR, PQ} = 12$ cm and $\text{PR} = 9$ cm and $\angle \text{Q} +\angle \text{R} = 120^{\circ}$. Find the length of $\text{QR}$

  1. $\dfrac{15}{\sqrt2}$ cm
  2. $3\sqrt13$ cm
  3. $5\sqrt5$ cm
  4. $5\sqrt17$ cm
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