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P comma Q blank are points on the ellipse fraction numerator x to the power of 2 end exponent over denominator 25 end fraction plus fraction numerator y to the power of 2 end exponent over denominator 16 end fraction equals 1 such that P Q is a chord through the point R left parenthesis 30 right parenthesis text  .  end text If vertical line P R vertical line equals 2 then length of chord P Q is

  1. 8   
  2. 6   
  3. 10   
  4. 4  

The correct answer is: 10


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