• # question_answer The multiplication inverse of a number is the number itself, then its initial value is   [RPET 2003] A) i B) - 1 C) 2 D) - i

Solution :

We know that, multiplicative inverse of $x+iy$ is $\frac{1}{x+iy}$ According to question $x+iy=\frac{1}{x+iy}$ and only (b) is satisfying such condition.

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