CAT Quant Practice Problems

Question: \({\rm{If\; }}f\left( x \right) = \log \left\{ {\frac{{\left( {1 + x} \right)}}{{1 - x}}} \right\},{\rm{then\; }}f\left( x \right) + f\left( y \right)is\)
  1. \(f\left( {x + y} \right)\)
  2. \(f\left\{ {\frac{{\left( {x + y} \right)}}{{\left( {1 + xy} \right)}}} \right\}\)
  3. \(\left( {x + y} \right)f\left\{ {\frac{1}{{\left( {1 + xy} \right)}}} \right\}\)
  4. \(\frac{{f\left( x \right) + f\left( y \right)}}{{\left( {1 + xy} \right)}}\)

Correct Option:2

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