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JEE Math Practice Question

If $$n$$ is a positive integer, then $${\left( {\sqrt 3 + 1} \right)^{2n}} - {\left( {\sqrt 3 - 1} \right)^{2n}}$$ is :

  1. A.an irrational number
  2. B.an odd positive integer
  3. C.an even positive integer
  4. D.a rational number other than positive integers

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