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1. what is the possibility of two people having the same birthday do you think if there is 20 people in a room? [单选题] *    
2. what is the possibility of two people having the same birthday do you think if there is 40 people in a room? [单选题] *    
3. what is the possibility of two people having the same birthday do you think if there is 60 people in a room? [单选题] *    
4. what is the possibility of two people having the same birthday do you think if there is 80 people in a room? [单选题] *    
5. what is the possibility of two people having the same birthday do you think if there is 100 people in a room? [单选题] *    
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