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For the truss shown in figure, the magnitude of the force in member PR and the support reaction at R are respectively

  1. $122.47$ $kN$ and $50$ $kN$
  2. $70.71$ $kN$ and $100$ $kN$
  3. $70.71$ $kN$ and $50$ $kN$
  4. $81.65$ $kN$ and $100$ $kN$
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