11th Class Mathematics Sample Paper Mathematics Olympiad - Sample Paper-6

  • question_answer
    \[z=\left( \frac{-1}{2}+\frac{\sqrt{3}}{2}i \right)\] is equal to

    A)  1                                

    B)  w       

    C) \[{{w}^{2}}\]                         

    D)  None of these

    Correct Answer: B

    Solution :

                [b] \[\because z={{\left( \frac{-1}{2}+\frac{\sqrt{3}i}{2} \right)}^{1000}}\] \[={{\left( \frac{-1+\sqrt{3}i}{2} \right)}^{1000}}\]        \[\because \omega =\frac{-1+\sqrt{3}i}{2}\] \[z={{\left( \omega  \right)}^{10000}}\] \[={{\omega }^{3\times 333+1}}\] \[=1.\omega =\omega \] Hence, option [b]is correct


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