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ISI2016-DCG-27

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If $A$ be the set of triangles in a plane and $R^{+}$ be the set of all positive real numbers,  then the function $f\::\:A\rightarrow R^{+},$ defined by $f(x)=$ area of triangle  $x,$ is

  1. one-one and into
  2. one-one and onto
  3. many-one and onto
  4. many-one and into

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