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JEE Mains · Maths · STD 11 - 4.1 complex nubers

माना सम्मिश्र संख्या \(Z\) के लिए समीकरण \(z ^{2}+3 \overline{ z }=0\) के मूलों की संख्या \(n\) है । तो \(\sum_{ k =0}^{\infty} \frac{1}{ n ^{ k }}\) का मान बराबर है -

  1. A \(1\)
  2. B \(2\)
  3. C \(\frac{4}{3}\)
  4. D \(\frac{3}{2}\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(\frac{4}{3}\)

Step-by-step Solution

Detailed explanation

\(z^{2}+3 \bar{z}=0\) \(\text { Put } z=x+i y\) \(\Rightarrow x^{2}-y^{2}+2 i x y+3(x-i y)=0\) \(\Rightarrow\left(x^{2}-y^{2}+3 x\right)+i(2 x y-3 y)=0+i 0\) \(\therefore x^{2}-y^{2}+3 x=0 \quad \ldots \ldots(1)\) \(2 x y-3 y=0 \quad \ldots \cdot\) \(x=\frac{3}{2}, y=0\) Put…
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