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Adding numbers that are next to each other in counting order

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Question
Answer
1+2   3  
2+1   3  
2+3   5  
3+2   5  
3+4   7  
4+3   7  
4+5   9  
5+4   9  
5+6   11  
6+5   11  
6+7   13  
7+6   13  
7+8   15  
8+7   15  
8+9   17  
9+8   17  
9+10   19  
10+9   19  


   

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