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For the ellipse fraction numerator x to the power of 2 end exponent over denominator 1 end fraction plus fraction numerator y to the power of 2 end exponent over denominator 4 end fraction equals 1, the latus rectum is

  1. fraction numerator 1 over denominator 2 end fraction    
  2. 1    
  3. 2    
  4. 4    

The correct answer is: 1

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