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The conjugate of a complex number is $\dfrac{1}{i-1}$. Then that complex number is

1) $\frac{-1}{i-1}$
2) $\frac{1}{i+1}$
3) $\frac{-1}{i+1}$
4) $\frac{1}{i-1}$
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(3)

Explanation

Put $-\mathrm{i}$ in place of $\mathrm{i}$ Hence $\dfrac{-1}{i+1}$

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