概率相加

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概率相加

P(A or B) = P(A) + P(B) - P(A and B)

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'''
 +-----------------------------------------+  
 |                                         |  
 |  /----------------\                     |  
 |  |                |                     |  
 |  |     A          |                     |  
 |  |          /--------------------\      |  
 |  |          | A   |              |      |  
 |  |          | and |    B         |      |  
 |  |          | B   |              |      |  
 |  |          |     |              |      |  
 |  \----------|-----/              |      |  
 |             |                    |      |  
 |             |                    |      |  
 |             \--------------------/      |  
 |                                         |  
 +-----------------------------------------+  

'''
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