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The sum of areas of two circles A and...

The sum of areas of two circles `A` and `B` is equal to the area of a third circle `C` whose diameter is 30 cm, If the diameter of circle `A` is 18 cm, then the radius of circle `B` is (a) 10 cm (b) 12 cm (c) 15 cm (d) 18 cm

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