Geometry

Question Analysis  
This question involves calculating probability using complementary events.  
The main focus is on understanding how to find the probability of an event (not gray) by subtracting the probability of its complement (gray) from 1.  

Key Concept Explanation  
Probability Formula:  
   
Complementary Events: For any event ,  
   

Step-by-Step Solution  
1. Total Outcomes: The bag has 12 socks, so the total number of possible outcomes is 12.  
2. Favorable Outcomes for Gray Socks: There are 3 gray socks, so  
 

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