यदि ${z_1} = 1 - i$ और ${z_2} = - 2 + 4i$ है,तो $\text{Im} \left( \frac{z_1 z_2}{z_1} \right) = $

  • A
    $1$
  • B
    $2$
  • C
    $3$
  • D
    $4$

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