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The locus of the center of the circle to...

The locus of the center of the circle touching the line `2 x - y = 1 ` (1,1) is

A

`x + 3y = 2 `

B

` x + 2y = 0`

C

` x + y = 2 `

D

None of these

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The correct Answer is:
B
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