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The centers of a set of circles, each of radius 3, lie on the circle `x^2+y^2=25` . The locus of any point in the set is `4lt=x^2+y^2lt=64` `x^2+y^2lt=25` `x^2+y^2geq25` (d) `3lt=x^2+y^2lt=9`

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