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Question

If fraction numerator x over denominator a end fraction plus fraction numerator y over denominator b end fraction = 1 is a tangent to the curve x = 4t,y =fraction numerator 4 over denominator t end fraction, t element of R then -

  1. a > 0 , b > 0    
  2. a > 0, b < 0    
  3. a < 0, b > 0    
  4. None of these    

The correct answer is: a > 0 , b > 0

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