Multiple Choice Questions on If z 4 radic 5i then zz rsquo is ........ for NDA Exam Preparation

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Multiple Choice Questions

If z 4 radic 5i then zz rsquo is ........

Mathematics (NDA) Complex Numbers
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    If z = 4 + √5i , then zz’ is ?

    12

    Incorrect Answer

    21

    Correct Answer

    31

    Incorrect Answer

    1

    Incorrect Answer
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    Explanation:

    zz’ = |z|2

    = ( √16 + 5)2

     = ( 16 + 5)

    = 21

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