यदि $\left|\begin{array}{cc}1-i & i \\ 1+2 i & -i\end{array}\right|=x+i y$ है, तो $x$ का मान ज्ञात कीजिए।

  • A
    $-2$
  • B
    $-1$
  • C
    $1$
  • D
    $2$

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