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The tangent to the circle C(1) : x^(2) +...

The tangent to the circle `C_(1) : x^(2) +y^(2) -2x -1=0` at the point ( 2,1) cuts off a chord of length 4 from a circle `C_(2)` whose centre is`( 3,-2)` . The radius of `C_(2)` is `:`

A

`sqrt(2)`

B

` sqrt( 6)`

C

3

D

2

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The correct Answer is:
B
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