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Find the number of arithmetic sequences such that:
* The arithmetic sequence contains three terms
* All the terms are integers in \{0, 1, 2, \dots, 10\}

* The sum of the terms is 9.

 Apr 18, 2025
 #1
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Find the number of arithmetic sequences such that:    
* The arithmetic sequence contains three terms    
* All the terms are integers in \{0, 1, 2, \dots, 10\}    

* The sum of the terms is 9.     

 

The ones I find are     0, 3, 6  and of course  6, 3, 0

                                   1, 3, 5  and  5, 3, 1     

                                   2, 3, 4  and  4, 3, 2     

                                   3, 3, 3  if it counts

 

I can't think of any more.  I found seven of them.    

.    

 Apr 19, 2025

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