1.

The vlaues of k for which the circles x ^(2) + y ^(2) =1 and x ^(2) + y ^(2) - 4x +k=0 have two comon tangents is

Answer»

`(- (9)/(4), (9)/(4))`
`(-OO, - (9)/(4)) UU ((9)/(4) , oo)`
`(-oo, - (9)/(4)] uu [ (9)/(4) , oo)`
NONE of these

Answer :B


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