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The locus of the centres of circles whic...

The locus of the centres of circles which touches `(y-1)^(2)+x^(2)=1` externally and also touches X-axis is

A

`{x^(2) = 4y,y ge 0 } uu { (0,y), y lt 0}`

B

`x^(2) =y`

C

`y = 4x^(2)`

D

` y^(2) = 4x uu ( 0,y ) , y in R `

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The correct Answer is:
A
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