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Q:

The radii of three concentric circles are in the ratio of 4 : 5 : 7. What is the ratio of the area between the two inner circles to that between the two outer circles?

  • 1
    4 : 7
  • 2
    3 : 8
  • 3
    4 : 5
  • 4
    5 : 9
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Answer : 2. "3 : 8"

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