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If C1 and C2 are the circumferences of the outer and inner circles respectively. What is C1 : C2? I. The two circles are concentric. II. The area of the ring is 2/3 the area of greater circle.

Correct Answer: if statement II alone is sufficient to answer the question.

Explanation:

If we look at Statement I
It is given that the circle are concentric. But nothing is given about their dimensions. Hence I alone is not sufficient.
In statement II ratio of area is given hence we can find the required ratio.


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