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Standard equation of hyperbola - class-XI

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Multiple Choice

Consider
the set of hyperbola $xy = {\text{ }}K,{\text{ K}} \in {\text{R,}}$  let ${e _1}$  be eccentricity
when $K = \sqrt {2017} $  and ${e _2}$ be the
eccentricity when $K = \sqrt {2018} $ , then ${e _1} = {e _2}$   is equal to 

  1. -1
  2. 0
  3. 2
  4. 1
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