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If S’ and S are the foci of the ellipse fraction numerator x to the power of 2 end exponent over denominator a to the power of 2 end exponent end fraction plus fraction numerator y to the power of 2 end exponent over denominator b to the power of 2 end exponent end fraction equals 1 and P (x, y) be a point on it, then the value of SP + S’P is

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  1. a – b    
  2. 2a    
  3. a + b.    
  4. 2b    

    Answer:The correct answer is: 2a

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