The conjugate of a complex number is \( \frac{1}{\mathrm{i}-1} \). ...

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The conjugate of a complex number is \( \frac{1}{\mathrm{i}-1} \). Then that complex number is-
(1) \( \frac{1}{i+1} \)
(2) \( \frac{-1}{i+1} \)
(3) \( \frac{1}{i-1} \)
(4) \( \frac{-1}{i-1} \)
\( \mathrm{P} \)
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