问题 单项选择题

对于任意两个事件A与B,下列式子成立的是()。

A.P(A-B)=P(A)-P(B)

B.P(A-B)=P(A)-P(B)+P(AB)

C.P(A-B)=P(A)-P(AB)

D.P(A-B)=P(A)+P(AB)

答案

参考答案:C

解析:

补全对话,情景问答
从Ⅱ栏中找出与I栏相对应的答语。
I                                                          
( )1. Good afternoon.                         
( )2. What's this?                          
( )3. Who's your friend?                       
( )4. Sit down please.                     
( )5. Nice to meet you.                   
( )6. Goodbye!                           
( )7. Good evening.                        
( )8. How are you?                     
( )9. Spell“pen" ,please.                   
( )10. Sorry.            
II                                                                 
A. That's all right.                                             
B. Goodbye !                                                     
C. I'm  fine ,thanks.                                            
D. Mike is my friend.                                            
E. P-E-N.                                                        
F. Good aftemoon.                                                
G. Thank you.                                                    
H. Good evening.                                                 
I. It's an apple.                                                 
J. Nice to meet you,too.     
综合