扑克中的概率和文氏图

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扑克中的概率

P(Jack) = 4/52 = 1/13

P(♥) = 13/52 = 1/4

P(J and ♥) = 1/52

p(J or ♥) = (4+13-1)/52 = 16/52 = 4/13

文氏图

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''''
                    # of Jacks               
                       /                          
                      /                           
           +---------/--------------------------+ 
           |        /                        52 | 
           |    /--/--\                         | 
           |    | 4   |                         | 
           |    |   /-----------\               | 
           |    \---|./         |               | 
           |      ,'`    13     |               | 
           |   _-`  |           |               | 
           | .'     \--------\--/               | 
          ,-`                 \                 | 
 # of J -` |                   \                | 
  and ♥    |                    \               | 
           +---------------------\--------------+ 
                                  \               
                                  # of ♥              
''''
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