Multiple Choice Questions on If is a purely imaginary number then is equal to ........ for 11th Standard Preparation

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Multiple Choice Questions

If is a purely imaginary number then is equal to ........

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    If \frac{5z_{2}}{7z_{1}}is a purely imaginary number, then \left | \frac{2z_{1}+3z_{2}}{2z_{1}+3z_{2}\frac{}{}} \right |is equal to

     

    5/7                    

    Correct Answer

    7/5                               

    Incorrect Answer

    25/49                            

    Incorrect Answer

    None of these

    Incorrect Answer
    Explanation:

    5/7  

    By: Swaminath Yadav
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