Two triangles are considered the same if they have the same three side lengths. Find all possible values of P such that there is only 1 possible triangle with integer side lengths and perimeter P.
Imagine P is 5. Then we could have 1, 1, 3 or 1, 2, 2.
Imagine P is 4. Then we could have 1, 1, 2. That's it
Imagine P is 3. Then we could have 1, 1, 1. That's it
When P is 2, there's no triangle like that.
If it's 5 or above, there will be multiple ways.
Therefore, there are 2 values of P.