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.
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.
.