Multiple Choice Questions on The smallest positive integer n for which 1 i 1 minus i n 1 is ........ for NDA Exam Preparation

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Multiple Choice Questions

The smallest positive integer n for which 1 i 1 minus i n 1 is ........

Mathematics (NDA) Arithmetic progression
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    The smallest positive integer n for which ( 1+i  / 1−i )n = 1, is -

    1

    Incorrect Answer

    4

    Correct Answer

    8

    Incorrect Answer

    16

    Incorrect Answer
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    Explanation:

     1+i /  1−i )n = ( 1+i / 1−i × 1−i / 1−i )n = (i)n = 1 => n = 4

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