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Question

The center of the set of circles, each of radius 2, lie on the circle x2+y2=49. The locus of any point in the set is

A
9x2+y281
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B
x2+y225
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C
x2+y225
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D
25x2+y281
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Solution

The correct option is C 25x2+y281
Minimum distance from origin to any point on circle is 72=5.
Maximum distance from origin to any point on circle is 7+2=9.
5x2+y29
25x2+y281
110624_72143_ans.jpg

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