Geometry

Question Analysis  
This question involves calculating basic probability for a single event.  
The main focus is on applying the fundamental probability formula to determine the likelihood of selecting a specific item (blue pencil) from a set.  

Key Concept Explanation  
Probability Formula:  
   
 Here, the "event" is choosing a blue pencil, and "favorable outcomes" refer to the quantity of blue pencils.  

Step-by-Step Solution  
1. Total Outcomes: The box contains 20 colored pencils, so the total number of possible outcomes is 20.  
2. Favorable Outcomes: There are 6 blue pencils, so the number of favorable outcomes is 6.  
3. Calculate Probability:  
 

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