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Multiple choice

If $(x_{1},y_{1})$ and $(x_{2},y_{2})$ are the solutions of the simultaneous equation $x+y=12$ and $2(2\log_{y^{2}}{x}-\log_{1/x}{y})=5$ then $x_{1}x_{1}-y_{1}y_{2}$ is equal to

  1. $0$
  2. $1$
  3. $2$
  4. None of these

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