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POQ is a straight line through the origin O,P and Q represent the complex numbers a+ib and c+id respectively and OP=OQ. Then, which one of the following is true?

A

`|a+ib|=|c+id|`

B

`a+b=c+d`

C

`"arg"(a+ib)="arg"(c+id)`

D

none of these

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The correct Answer is:
a
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