Geometry

Question Analysis  
This question involves calculating the probability of non-mutually exclusive events in a bookstore setting.
The main focus is applying the union formula using counts of hardcover books (A) and fiction books (B).  

Key Concept Explanation  
For non-mutually exclusive events, the formula accounts for overlapping elements (hardcover fiction books) to avoid double-counting.
The intersection must be subtracted from the sum of individual probabilities.  

Step-by-Step Solution  
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