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A target shown in Figure, consists of three concentric circles of radii 3,7 and 9cm respectively. A dart is thrown and lands on the target. What is probability that the dart will and on the shaded region?

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Given: A target is shown in figure consists of three concentric circles of radius 3, 7, and 9 cm. A dart is thrown and lands on the target.
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Total area of circle with radius 9 cm.
Area of radius 9 cm `=pi r^2`
...
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