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If P(0,0), Q(1,0) and R(1/2,sqrt3/2) are...

If P(0,0), Q(1,0) and R`(1/2,sqrt3/2)` are three given points, then the centre of the circle foe which the lines PQ, QR and RP are the tangents is

A

`(1/2,1/4)`

B

`(1/2,sqrt3/4)`

C

`(1/2,1/(2sqrt3))`

D

`(1/2,-1/sqrt3)`

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