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Subject :IMO    Class : Class 10

A circle with area A1 is contained in the interior of a larger circle with area A1 + A2. If the radius of the larger circle is 3 units and A1, A2, A1 + A2 are in A.P., then the radius of the smaller circle is _____.

A units
B 1 unit
C 2 units
D units

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