1.

A circle passes thorugh A(2,1) and touches y-axis then the locus of its centre is

Answer»

`(y+1)^(2)=4(x+1)`
`(x+1)^(2)=4(y+1)`
`(y-1)^(2)=4(x-1)`
`(x-1)^(2)=4(y+1)`

ANSWER :C


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