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Consider a family of circles which are p...

Consider a family of circles which are passing through the point `(-1,1)` and are tangent to the x-axis. If `(h ,k)` are the coordinates of the center of the circles, then the set of values of `k` is given by the interval.
(a)`kgeq1/2` (b) `-1/2lt=klt=1/2` `klt=1/2` (d) `0`<`k`<`1/2`

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