જો $z_1=x_1+i y_1$, $z_2=x_2+i y_2$, $z_3=x_1+\frac{i x_2}{2}$, અને $z_4=2 y_1+i y_2$ એવી સંકર સંખ્યાઓ હોય કે જેથી $|z_1|=1$, $|z_2|=2$, અને $\operatorname{Re}(z_1 \bar{z}_2)=0$ થાય, તો:

  • A
    $|z_3|=1, |z_4|=2, \operatorname{Im}(z_3 z_4)=0$
  • B
    $|z_3|=2, |z_4|=1, \operatorname{Re}(z_3 z_4)=0$
  • C
    $|z_3|=1, |z_4|=2, \operatorname{Re}(z_3 z_4)=0$
  • D
    $|z_3|=2, |z_4|=1, \operatorname{Re}(z_1 z_3)=\operatorname{Im}(z_2 z_4)=0$

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