Geometry

Question Analysis  
This question tests conditional probability in a compound geometric setting.
The main focus is determining the probability of a dart landing in a smaller circle given that it has landed in a larger containing circle.  

Key Concept Explanation  
Conditional Probability in Geometry: When dealing with concentric circles, the probability is the ratio of the area of the desired region (innermost circle) to the total possible region (middle circle).  
The formula becomes:  

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