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If the imaginary part of (2+i)/(ai-1) is...

If the imaginary part of `(2+i)/(ai-1)` is zero, where a is a real number, then the value of a is equal to

A

`(1)/(2)`

B

`2`

C

`(-1)/(2)`

D

`-2`

Text Solution

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The correct Answer is:
C
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