positive combinations:14
positive combinations not counting
the same one just flipped:7
combinations including negatives: infinate
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There are 13 combinations.
There are several combinations to this question:5 and 197 and 1711 and 13
The 13 interior angles add up to 1980 degrees
The 13 interior angles of a 13 sided polygon add up to 1,980 degrees
It is 42