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JEE Math Practice Question

If $${\left( {{{1 + i} \over {1 - i}}} \right)^x} = 1$$ then :

  1. A.x = 2n + 1, where n is any positive integer
  2. B.x = 4n , where n is any positive integer
  3. C.x = 2n, where n is any positive integer
  4. D.x = 4n + 1, where n is any positive integer.

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