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Question

If the conjugate of (x+iy)(1-2i) be 1+i, then


A

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B

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C

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Solution

The correct option is C


Given that ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯(x+iy)(12i) = 1+i

⇒ x-iy = 1+i1+2ix+iy=1i12i.


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